Top picks for Koh Samui Water activities

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Discover 37 Water activities in Koh Samui on Trip.com, updated October 19, 2026, with experiences lasting from 1 to 9 hours. Find the perfect adventure for your day!

From TWD 1,076 per person, with an average total of TWD 2,607. Choose the option that suits your plan.

With 482 verified reviews, Water activities Koh Samui boast an average rating of 4.4.

This week's most popular Water activities: "One-day tour to Angthong Marine National Park", with 208 reviews and a 4.5 rating.

Now on Trip.com: "Departing from Koh Samui: Koh Madsum & Tean Island snorkeling experience | dolphin chasing tour upgrade available", a 5-hour adventure in Koh Samui!

The next available day tour departs on October 20, 2026. Book now to secure your spot!

Koh Samui Water activities usually take about 5 hours — perfect for a relaxed, immersive experience!

100% of Koh Samui Water activities now offer English-speaking guides

October is perfect for visiting Koh Samui! Choose from 37 available day tours, including seasonal hits like One-day tour to Angthong Marine National Park.

Your trip, worry-free! All day tours are run by licensed suppliers with verified reviews, and many include free cancellation before departure.

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37 results for Koh Samui Water activities

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Reviews/Trip Moments

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Reviews: Departing from Koh Samui: Koh Madsum & Tean Island snorkeling experience | dolphin chasing tour upgrade available
Guest User2026-10-05
The pigs simply stole our hearts. We never would have thought we loved pigs so much. 😁. Definitely a must-see!
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Reviews: Koh Samui Departure: Mu Ko Ang Thong National Park Sightseeing and Snorkeling|Upgradable kayaking adventure
Guest User2026-10-08
Well organised! Incredible views and the staff is so nice! English speaking and helpful taking pictures!
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Reviews: 1-day tour to Mu Ko Ang Thong National Marine Park from Koh Samui [snorkeling/lunch/transfer/kayaking]
Guest User2026-09-08
The route matched the description. The excursion itself was wonderful. I highly recommend it. We were with the Funny Day team. They're great guys, but there was one major drawback I didn't like. On the way back from the archipelago to Koh Samui, we ran out of gas. Oh well, it happens. We first took some gas from a boat traveling alongside, but it wasn't enough. Then we waited for a second boat to bring gas and pick up some of the people. And it seemed like everything should go smoothly from there, but no! The new boat also ran out of gas 100 meters from the beach. And we waited for a third boat. They need to fix this urgently and bring extra gas. Otherwise, the excursion itself, the views, the snorkeling, and the kayaking were amazing. The views from the observation deck are incredibly beautiful, but the climb is very difficult and is best done in sneakers.
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Reviews: One-day tour to Angthong Marine National Park
Guest User2026-09-22
Incredible tour!! Mr. Tu is the best. Everything was exactly as described, the guide and accompanying staff were incredibly cool. Water and cola were offered at every stage, and beer was available for an extra fee. I really enjoyed it, I highly recommend it.
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Reviews: Koh Samui: Koh Tao and Ko Tao + Nang Yuan Island 1-day tour speedboat snorkeling with hotel transfer and lunch included
Guest User2026-09-30
A perfectly organized trip! They picked us up from the hotel, took us to the pier, gave us something to drink, fed us, and then we were off! Everything was explained clearly, even with my limited English. We arrived back on time and were dropped off home. Thanks for the trip!
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Reviews: Depart from Koh Samui: Private Charter Boat Tour [Snorkeling + Island Hopping]|Longtail Boat (Optional)|Speedboating, etc.
Guest User2026-10-15
Private longtail trip to Koh Mudsum (Pig Island) and Koh Tan with our two boys. Boat and driver were great: kind, careful and on time, and the weather cleared up nicely. Good value for a private boat. One thing to improve: we had no explanation of what was on each island or what to expect, so a short briefing at the start would make it even better. Bring cash for the āļŋ50 pp entrance fee at Koh Mudsum.
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From Koh Samui: Island Sightseeing Shared Tour by Army JeepThailand Koh Samui Day Tour Koh Samui 1-day tour to Ang Thong National Marine Park by big boat - Optional kayaking - English-speaking guidePig Island Experience By Speed Boat, Snorkeling, Kayaking Relaxing on the BeachKoh Samui MR.TU Sea Fishing: Fresh Seafood Processing|Professional Fishing BoatFrom Koh Phangan: Day Tour Ang Thong with Kayak, Snorkel & Lunch1-day tour to Mu Ko Ang Thong National Marine Park from Koh Samui Koh Samui: Introduction Private Class Muay Thai Boxing for BeginnersKoh Samui vintage red sailing boat sunset tour with pickup service and buffetKoh Samui: Private Longtail Boat to Pig Island with SnorkelKoh Samui Departure: Mu Ko Ang Thong National Park Sightseeing and Snorkeling|Upgradable kayaking adventureKoh Madsum + Tean Island premium speedboat/Neptune boat double island hopping/snorkeling experience/island-wide transferDeparting from Koh Samui: Koh Madsum & Tean Island snorkeling experience | dolphin chasing tour upgrade availableTean Island 1-day tour Koh Samui Private Driver Tour Custom Route, Hotel & Port PickupKoh Samui Travel ServicesKoh Samui ActivitiesKoh Samui Yacht CharterKoh Samui Boat TicketsWellness & Spa in Koh SamuiKoh Samui Connectivity SolutionsKoh Samui Cultural ExperienceKoh Samui Day ToursKoh Samui Group ToursKoh Samui Sports & AdventureKoh Samui Bus TicketsKoh Samui ClassesKoh Samui Airport ServicesKoh Samui SIM CardThings to do in ShanghaiThings to do in BeijingThings to do in Hong KongThings to do in OsakaThings to do in ZhangjiajieThings to do in SingaporeThings to do in ChongqingThings to do in TokyoThings to do in GuangzhouThings to do in Xi'anThings to do in ChinaThings to do in JapanThings to do in ThailandThings to do in VietnamThings to do in South Korea