- For a couple, a 2.5-hour sunset cruise on a small catamaran is the best value: Victoria costs ฿21,000 and Nina ฿22,000 per boat.
- On Nina, Victoria, Vickey, Scarlet and Blue Coco you may bring your own food, drinks and cake free of charge, and champagne glasses are on board.
- For a birthday party, Blue Coco takes up to 25 guests with a butler and a bartender, and Coco Paradise up to 45 guests.
- From about November to January the north-east monsoon can make the sea rough, so keep a spare date in your plan.
A birthday boat trip in Koh Samui works best on a private boat in the late afternoon, timed so the cake, the toast or the ring comes out just as the light turns gold. One evening last season a guest spent the whole crossing to Koh Tan pretending to read a book, with a ring box in his swim shorts pocket, while his girlfriend took photos of the water. The crew had dropped anchor in a quiet bay before he even stood up.
That is the whole secret of a celebration at sea: the boat is yours, nobody else is on deck, and a good crew knows how to disappear. Below is how to choose the boat, the time and the details, plus the honest downsides nobody mentions in the brochure.
Which boat suits a birthday boat trip in Koh Samui?
For two people, choose a small sailing catamaran on a sunset slot; for a group of friends, choose a big catamaran with space to dance and a crew to serve. Every price is for the whole boat with captain and crew, not per person, so the right size matters more than the brand.
Catamarans are the natural choice for celebrations. They sit flat at anchor, so a cake stays on the table and nobody spills a glass. They also have trampolines at the bow, which is where couples tend to end up at sunset.
Motor yachts are for people who want air-conditioned cabins, a flybridge and a feeling of luxury. They cost a lot more, and they shine on a longer day rather than a short evening. Speedboats are fast and fun for a group day out, but they are loud and bouncy, and I would not plan a proposal on one.
| Boat | Best for | Shortest celebration option | Price per boat | Guests |
|---|---|---|---|---|
| Victoria (catamaran) | Couples, small families | Sunset cruise to Koh Tan, 16:00-18:30 | ฿21,000 | Up to 8 in the price, max 13 |
| Nina (catamaran) | Couples, small groups | Sunset cruise to Koh Tan, 16:00-18:30 | ฿22,000 | Up to 8 in the price, max 15 |
| Vickey (catamaran) | Couples, proposals | Afternoon and sunset, Koh Som or Koh Mad Lang, 14:00-18:30 | ฿22,000 | Up to 6 in the price, max 10 |
| Scarlet (catamaran) | Birthdays with friends | Sunset cruise, Koh Som or Thongson Bay, 16:00-18:30 | ฿28,900 | Up to 8 in the price, max 20 |
| Hilux (motor yacht) | Short sunset with a group | Sunset program at the Five Islands, 16:30-18:30, on request | ฿18,000 | 1-10 in the price, max 20 |
| Blue Coco (catamaran) | Birthday parties | Afternoon half day, 13:30-18:30 | ฿41,000 | Up to 10 in the price, max 25 |
| Coco Paradise (catamaran) | Big parties | Afternoon half day, 13:30-18:30 | ฿50,000 | Up to 10 in the price, max 45 |
| Lisa (motor yacht) | Anniversaries | Afternoon half day, Pig Island and Koh Tan, 14:30-18:30 | ฿85,000 | Based on 10, max 13 |
Extra guests above the number in the price are charged per person, and the amount differs by boat. A manager confirms the final price for your group after you send the request, so do not try to guess a total from the table.
How do you plan a proposal on a boat without anyone noticing?
Book a small catamaran for just the two of you, tell the manager it is a proposal, and agree on a signal with the crew. A boat that takes only your party is the only kind of boat where a proposal stays private.
Vickey is my favourite for this. It is a sailing catamaran 11 metres long with one double cabin, and it is small enough that two people do not feel lost on deck. The afternoon trip runs from 14:00 to 18:30 to Koh Som or Koh Mad Lang, which gives you swimming and snorkelling first and the golden hour at the end.
Victoria and Nina are the other two good options for couples. Both run a 2.5-hour sunset cruise from 16:00 to 18:30 to Koh Tan, from the Treasure Pier at Thong Krut in the south of the island. Victoria costs ฿21,000 and Nina ฿22,000 for the whole boat. Note that hotel transfer is not included on these two, and 7% VAT is charged separately.
A few things that make the moment work:
- Tell the manager in the booking request, not on the pier in front of your partner.
- Agree on when you want the crew to step away: most crews will happily busy themselves at the stern.
- Give the ring to the captain to keep dry until the moment, or use a zip bag. A ring dropped from a trampoline net is gone.
- If you want photos, ask whether a crew member can take them, or bring a friend as a "photographer on holiday".
- Have a cover story for the boat trip. "I booked a sunset cruise" is believable on Koh Samui, nobody asks more.
One honest warning: if your partner gets seasick, keep the trip short and the route sheltered. A proposal with someone green at the rail is a story, but not the one you wanted.
When is the best time to sail for the sunset?
Book a slot that ends at 18:30, because that is when the sunset cruises are built to finish. The sunset slots on Victoria, Nina and Scarlet run from 16:00 to 18:30, and the Vickey afternoon trip runs from 14:00 to 18:30.
The south and south-west of Samui face the open sea towards the small islands, so sunset trips to Koh Tan from Thong Krut usually give a clean view of the evening sky. Scarlet leaves from Choeng Mon Beach or Bang Rak Beach in the north-east, sails to Koh Som or Thongson Bay, and has the advantage of hotel transfer being included.
A 2.5-hour trip sounds short, but for a celebration it is often the sweet spot. You have time for a swim, a drink and the moment itself, and nobody is tired or sunburnt. A full day is better if the celebration is the whole point of the holiday and you also want snorkelling and a beach.
For more on sunset routes and boats, read the guide to the sunset cruise on Koh Samui by catamaran, junk or yacht. If your group is staying in the west, Hilux also runs a 2-hour sunset program at the Five Islands, 16:30-18:30, for ฿18,000, but only on request, so ask early.
Can you bring a cake, drinks and decorations on board?
On several catamarans, yes: you may bring your own snacks, food and drinks free of charge, and champagne glasses and dishes are already on board. This is written for Nina, Victoria, Vickey, Scarlet and Blue Coco; on other boats, ask the manager before you buy anything.
What exactly the crew can arrange (a cake, flowers, a sign, a special dinner) depends on the boat and the date. I will not promise anything here that is not on the boat pages: ask the manager what is possible and what it costs. Things go smoothly when you ask a few days ahead.
Questions worth sending in your request:
- Can we bring our own cake, and is there a fridge or cool box to keep it?
- Can the crew help with flowers or simple decorations, and at what cost?
- Is there music on board? Several boats, including Nina, Victoria, Scarlet and Lisa, list a Bluetooth speaker.
- Is food included on our trip length? Scarlet serves a Thai lunch only on 6- and 8-hour trips, Nina only on the 10-hour trip.
- What time do we need to be at the pier, and is hotel transfer included?
A practical tip on cakes: buttercream and the Thai afternoon heat do not get along. A firm cake, a cheesecake or a fruit tart travels much better in a cool box than anything with whipped cream. Candles also blow out at sea, so bring a lighter and accept that it takes three tries.
Keep decorations light and tied down. Balloons and loose paper end up in the sea, the crew will not thank you for it, and neither will the turtles.
Is a motor yacht worth it for an anniversary?
A motor yacht is worth it when you want privacy, air conditioning and a feeling of occasion for a longer day, not when you only want a sunset. Lisa's half day costs ฿85,000 and includes 2 bottles of wine or 24 cans of beer, which makes it the most "ready to celebrate" yacht on the list.
Lisa is a 43-foot Fairline with two double cabins and room for 13 guests. The half day goes to Pig Island (Koh Madsum) and Koh Tan, either 09:00-13:00 or 14:30-18:30, and hotel transfer is included. For an anniversary I would take the afternoon slot and finish the day on the water.
Princess 42 is the other good anniversary yacht: a flybridge motor yacht with two double cabins, from ฿77,000 for 4 hours to Koh Tan. The flybridge with its bimini is the best seat on the boat for two. An extra hour costs ฿20,000, so plan the timing rather than extending on the day.
At the top end, Minor Affair is a Sunseeker Manhattan 60 with three double cabins for up to 12 guests. Every trip is a full 8-hour day, from ฿260,000 around Koh Samui, with a Thai lunch included and wine from the wine list by prior arrangement. It is a lot of money, and honestly most couples are just as happy on a catamaran at sunset. It makes sense for a big round-number anniversary with family on board.
You can compare all of them on the motor yacht charter page.
Which boats work for a birthday party with friends?
For 10 to 25 people, Blue Coco is the easiest party boat; for up to 45, Coco Paradise. Blue Coco comes with a butler and a bartender as part of the crew, which changes the whole mood of a birthday.
Blue Coco is a Lagoon 400 catamaran with 3 double cabins, each with its own bathroom and air conditioning. The afternoon half day, 13:30-18:30, to Koh Tan, Koh Madsum or Koh Rap costs ฿41,000 for up to 10 people. A welcome drink, soft drinks with ice, fruit, tea snacks and a beach picnic are included, and you can bring your own food and drinks.
Coco Paradise is the bigger party: 3 cabins, a foredeck lounge, and room for up to 45 guests. The afternoon half day to Koh Tan and Koh Madsum costs ฿50,000 for up to 10 guests. A dedicated butler looks after the group, and pastries from a local pastry chef are served on board. The ocean pool and water slide cost ฿3,000 extra.
Scarlet is the middle ground for a birthday with 8 to 20 friends. It has a slide on trips of 4 hours and longer, paddle boards, a grill and a captain with 3 staff. For really large events of 25 people and more, Serenity has a living room where 25 guests can sit down to eat at the same time; read the group boat charter guide before you choose.
Which boat suits whom, in short: Vickey and Victoria for a quiet couple's evening, Nina and Scarlet for a small birthday crowd that wants to swim and play.
And for bigger budgets and bigger parties: Blue Coco and Coco Paradise for groups with service, Lisa and Princess 42 for an anniversary in comfort.
What happens if the weather turns on your big day?
The route can change, and on a rough day the trip can be postponed. From about November to January the north-east monsoon can make the Gulf of Thailand rough, and no captain will take a party out into weather that is not safe.
This is the part people forget when they plan a proposal for one exact evening. A birthday has a date, but the celebration on the water does not have to be on that date. Book the trip a day or two before the real date, so you still have a spare evening if the sea says no.
The rest of the year is calmer, though a squall can still roll through in the afternoon. A good crew moves to the sheltered side of an island, and a catamaran with a covered saloon keeps the cake dry. Check the month-by-month guide to boat trips on Koh Samui before you fix the date.
Also remember that Ang Thong National Marine Park is usually closed every year from 1 November to 15 December. That rarely matters for a sunset celebration, since the short trips go to Koh Tan, Koh Madsum and Koh Som, but it matters if you dreamed of a full-day anniversary in the park.
How far ahead should you book, and what should you tell the manager?
Book as soon as you know your dates, especially for high season and holidays, because the small sunset catamarans are popular with couples. The request is free and non-binding: a manager checks the boat is free on your date and confirms the final price.
Send everything in one message, on WhatsApp or through the booking request on the boat page:
- the date and a backup date;
- the number of adults and children, with ages;
- the occasion, and whether it is a surprise;
- where you are staying, so the pickup or the right pier can be confirmed;
- what you plan to bring: cake, drinks, flowers.
If you are still unsure between a catamaran and a yacht, start from the catamaran charter page: for most birthdays and nearly every proposal, that is where the right boat is.
Questions and answers
How much does a private sunset boat trip for two cost on Koh Samui?
The cheapest sunset cruise is on Victoria for ฿21,000 for the whole boat, 16:00-18:30 to Koh Tan. Nina costs ฿22,000 for the same time slot. The price is for the boat, not per person, and 7% VAT is charged separately on both.
Can I bring champagne on a private boat?
On Nina, Victoria, Vickey, Scarlet and Blue Coco you can bring your own drinks and food free of charge, and champagne glasses are on board. On other boats, ask the manager first. Lisa already includes 2 bottles of wine or 24 cans of beer.
Is a catamaran or a speedboat better for a birthday?
For most birthdays, a catamaran. It is stable at anchor, has shade, space to sit together and often a slide or paddle boards. A speedboat is better when the birthday group wants to cover distance fast, but it is noisy and less comfortable for a toast.
Do the boats pick us up from the hotel?
It depends on the boat. Hotel transfer is included on Scarlet, Lisa, Princess 42 and Minor Affair, while Nina and Victoria leave from the Treasure Pier at Thong Krut and do not include it. The manager tells you the meeting point when the booking is confirmed.
Can children come on a birthday boat trip?
Yes, the boats take families. On Nina, Victoria, Scarlet and Lisa, children aged 4-9 pay half of the extra-guest price. Life jackets are on board, but ask for small sizes if your children are young.
What if my partner gets seasick?
Choose a catamaran, a short trip and a sheltered route like the sunset cruise to Koh Tan. Avoid long crossings and the windiest months. Take any seasickness tablets before you board, not when you already feel unwell.
Can we extend the trip if we are having a great time?
On some boats you can, if the boat is free. Princess 42 charges ฿20,000 for an extra hour, and Serenity ฿16,000, subject to availability. It is safer to book the right length from the start.
Ready to choose your boat?
Every boat page shows the routes, prices and what is included. The booking request is free: a manager checks the boat is free on your date and confirms the price.
Updated 12 November 2026. Prices can change: the boat page always shows the current price.
