Koh Sak
A mostly uninhabited island next to Koh Larn, 20 to 25 minutes by speedboat from Pattaya, visited on island-hopping tours for its east-side reef.
Details
- Address
- Bang Lamung District
Tours that include Koh Sak
Skip-the-line entry, guided visits and day-tour combos around Koh Sak.
Why go, and how to do it well
Koh Sak is the small island just north of Koh Larn, mostly uninhabited, with no ferry, no village and no accommodation. It gets visitors because its reef, on the east side, is in better shape than the busy stretches around Koh Larn, and because the island-hopping tours from Pattaya stop here for snorkeling and sea walking. Expect a short beach and a lot of boats at midday; the snorkeling is the reason to come, not the sand.
Most people see it on a group tour that pairs Koh Sak with Koh Larn and Koh Khrok, with a stop of around 45 minutes. Chartering a speedboat costs more but lets you arrive before the tour groups and stay as long as you like. There is no dock everywhere, so be ready to wade ashore.
Written by Mac Kiley · Updated Oct 2026
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Tours that include Koh Sak
Skip-the-line entry, guided visits and day-tour combos around Koh Sak.
Experience hints
Pair your visit. After Koh Sak, round out your day in Pattaya with contrasting stops nearby.
Bang Lamung District
Open in Google MapsMore islands nearby
All within 3.1 km away of Koh Sak.
Koh Khrok
A tiny island off Koh Larn with a small pier and a shallow reef of 2 to 5 meters, a gentle first snorkel or dive on Pattaya island-hopping trips.
Ko Lan
A cheap 45-minute ferry buys you beaches, viewpoints and monkeys, but go on a weekday.
Tips for Visiting Islands
Check Island Closures
Similan Islands, Surin Islands, and Koh Tachai close mid-May to mid-October. Some smaller islands reduce ferry service in monsoon season. Always verify schedules before planning your route.
Snorkel Gear Is Cheap to Buy
Rental gear is often scratched and ill-fitting. Buy a decent mask and snorkel at a Big C for 300–500 THB — cheaper than two days of rentals and much more hygienic.
Bring Cash to Smaller Islands
ATMs on smaller islands like Koh Kood, Koh Mak, and Koh Yao charge high fees and sometimes run out of cash. Withdraw enough on the mainland before heading over.
Koh Sak: Frequently Asked Questions
Is Koh Sak worth visiting?
Koh Sak holds a 4.5★ rating from 406 Google reviews, placing it among the highest-rated islands in Pattaya.
When is the best time to visit Koh Sak?
The best months to visit Pattaya are November – February, with the most reliable weather. Crowds peak in December – January — going early in the day usually means fewer people. Months to think twice about: June – October (rainy, rough seas).
Where is Koh Sak located?
Koh Sak is at Bang Lamung District, in Pattaya. Getting around Pattaya: Baht buses (songthaews on fixed routes); Grab (widely available).
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