Koh Samui Boat Tours Ranked by Seasickness Risk

Short answer: Start with Koh Samui: Angthong National Marine Park 42-Island Speedboat Tour (Backpacker Samui Travel); Koh Samui Ang Thong Big Boat Snorkeling with Optional Kayaking (Siam Scape Journeys); Koh Samui: Angthong Catamaran Tour with Kayak, Snorkel, and Lunch (Oh-Hoo). Their listings describe the calmest water or most stable boats. Our score is an estimate from the listing text. Updated 2026-11-02

We scored 19 boat tours in Koh Samui from their listings. 3 tours of 19 score 2 or lower on our 1–5 seasickness risk scale. The calmest options are Koh Samui: Angthong National Marine Park 42-Island Speedboat Tour (Backpacker Samui Travel); Koh Samui Ang Thong Big Boat Snorkeling with Optional Kayaking (Siam Scape Journeys).

This score is our estimate from the listing’s description, not an operator figure. How we score.

TourSeasickness riskOperatorFrom
Koh Samui: Angthong National Marine Park 42-Island Speedboat Tour
“With their dramatic limestone cliffs, hidden lagoons, white sandy beaches, and crystal-clear waters, the scenery feels like something out of a dream.”
 2/5Backpacker Samui Travel$63Check dates
Koh Samui: Angthong Catamaran Tour with Kayak, Snorkel, and Lunch
“Visit the iconic Emerald Lagoon (Talay Nai) at Koh Mae Ko, a striking saltwater lagoon framed by lush jungle and cliffs, before arriving at Ko Wua Ta Lap, where you can hike to the Wua Ta Lap Viewpoint for panoramic…”
 2/5Oh-Hoo$85Check dates
Koh Samui Ang Thong Big Boat Snorkeling with Optional Kayaking
“Visit Talay Nai, the Emerald Lagoon, a hidden saltwater lake enclosed by cliffs.”
 2/5Siam Scape Journeys$40Check dates
Ang Thong National Marine Park Tour by Big Boat from Koh Samui
“Estimate from activity type”
 3/5Click2GoThailand.com$39Check dates
Koh Samui: Koh Tao & Koh Nang Yuan Snorkeling Tour by Speed Boat
“Estimate from activity type”
 3/5Backpacker Samui Travel$60Check dates
Koh Samui to Angthong National Marine Park Trip By Big Boat
“Estimate from activity type”
 3/5Oh-Hoo$33Check dates
Pig Island ,Snorkeling, Private Long Tail Boat (Local Thai Experience)
“Estimate from activity type”
 3/5Backpacker Samui Travel$106Check dates
Koh Samui: Angthong Marine Park Premium Catamaran Experience
“Travel in comfort on a stable twin-hull catamaran, offering a smoother ride than traditional speedboats.”
 3/5Happy Samui$88Check dates
Koh Samui: Pig Island Sightseeing & Snorkeling by Catamaran
“Estimate from activity type”
 3/5Backpacker Samui Travel$56Check dates
Snorkeling and Kayaking Tour at Angthong Marine Park by Speedboat from Koh Samui
“Enjoy a premium service trip from Koh Samui to Angthong National Marine Park by Speedboat.”
 3/5Oh-Hoo$60Check dates
Koh Tao & Koh Nangyuan by Speed Boat (Snorkeling trip from Koh Samui)
“Estimate from activity type”
 3/5My Samui Trip$55Check dates
Koh Samui Angthong Marine Park Snorkeling Trip by Speedboat
“Hop aboard a thrilling speedboat journey from Koh Samui to Angthong National Marine Park, a stunning archipelago of 42 islands with dramatic cliffs, caves, and lush jungles.”
 3/5Siam Scape Journeys$70Check dates
Snorkeling Tour Koh Tao & Koh Nang Yuan from Samui by Speedboat
“Hop aboard a speedboat for 1:30 hrs.”
 4/5Koh Samui Tour & Transportation$58Check dates
Ang Thong National Marine Park Speedboat from Koh Samui
“High-quality speedboat tour with unbeatable price!”
 4/5Click2GoThailand.com$63Check dates
Koh Tan and Pig Island Speed Catamaran Tour from Koh Samui
“A light meal on board keeps you energized throughout the trip.”
 4/5Oh-Hoo$58Check dates
Pink Dolphin and Pig Island by Speedboat from Koh Samui
“Imagine cruising across the Gulf of Thailand as the morning sun rises over Koh Samui, feeling the fresh sea breeze while your speedboat heads toward the peaceful Khanom coast.”
 4/5Oh-Hoo$54Check dates
Koh Tao Scuba Diving Tour from Koh Samui: 2 Dive Sites and Lunch
“Please note that the boat used for this activity will either be a speedboat or a catamaran, depending on weather conditions.”
 4/5Oh-Hoo$108Check dates
Pig Island Tour by Speedboat with Snorkeling
“After hotel pickup, travel to the quieter south of the island, where a shorter land transfer is rewarded with a quick and smooth speedboat ride across calm, shallow waters—ideal for those who prefer to avoid long boat…”
 4/5Happy Samui$56Check dates
Pig Island Tour by Teak Cruise with Snorkeling From Koh Samui
“Travel aboard your handcrafted teak cruise and enjoy a thoughtfully designed journey with spacious decks, tropical sea views, and attentive service throughout the day.”
 4/5Highsea Tour$30Check dates

Questions

Which boat tour in Koh Samui is best if I get seasick?

Start with Koh Samui: Angthong National Marine Park 42-Island Speedboat Tour (Backpacker Samui Travel); Koh Samui Ang Thong Big Boat Snorkeling with Optional Kayaking (Siam Scape Journeys); Koh Samui: Angthong Catamaran Tour with Kayak, Snorkel, and Lunch (Oh-Hoo). Their listings describe the calmest water or most stable boats. Our score is an estimate from the listing text.

How up to date is this information?

We last checked these listings on 2026-11-02 and re-check every listing monthly. Operators can change their rules, so confirm before you book.

Restrictions come from each tour’s listing on GetYourGuide or Viator: the suitability notes, “Know before you go”, booking rules, and what is and isn’t included. Last checked 2026-11-02. Operators change rules, so confirm before you book.

More about boat tours in Koh Samui

Seasickness risk: boat tours elsewhere