Snorkeling in Khao Lak: Similan Islands, Surin Islands & Local Reefs

Khao Lak is one of the best bases in Thailand for snorkeling, sitting within easy reach of two marine national parks — the Similan Islands and the Surin Islands — as well as quieter reefs close to shore. Each option has a different character, and the right one for you depends on how much time you have, how far you want to travel, and what you most want to see underwater.

Below is a quick guide to each destination, including who it suits best, what marine life to expect, and direct links to book. If you’re not sure where to start, jump to the comparison table and FAQ further down the page.

similans liveaboards

Similan Islands Snorkeling

The Similan Islands National Park is the headline act of Andaman Sea snorkeling — granite boulder islands rising out of impossibly clear, turquoise water with visibility regularly reaching 20–30 metres in peak season. Snorkelers swim over healthy coral gardens and around massive submerged boulders, with sightings ranging from reef fish, parrotfish and clownfish to turtles and blacktip reef sharks Our snorkeling trips run from 15 Oct to 15 May and are designed for relaxed, all-ability snorkeling.

See Similan Snorkeling Trips
Snorkeler exploring shallow coral reef at the Surin Islands, Thailand

Surin Islands Snorkeling

The Surin Islands sit further north along the Andaman coast and offer a noticeably quieter, more remote alternative to the Similans. The reefs here are shallower, making them especially good for relaxed snorkeling close to the surface, with vibrant hard coral gardens and a different mix of marine life including anemone reefs and reef fish in dense schools. A Surin trip is also a chance to learn about the Moken “sea gypsy” community, who have lived among these islands for generations. 

See Surin Snorkeling Trips
local longtail boat for half day local snorkeling trips

Local Snorkeling — Khao Lak

If you’re short on time, traveling with non-divers, or simply want a half-day in the water without the longer boat ride out to the national parks, our local Khao Lak snorkeling spots are a great option. These nearshore reefs are just a short 20 minute boat ride away, making them ideal for young children, and anyone joining as a non-diving companion on a local diving trip. While the marine life is less dramatic than the Similans or Surins, it’s a relaxed and affordable way to get in the water and see Thailand’s reefs first-hand.

Ask Us About Local Snorkeling

Snorkeling comparison table

 

Similan Islands

Surin Islands

Local (Khao Lak)

Distance from Khao Lak

60km — full day trip

60+km — full day trip

Closest — half day possible

Water & visibility

Clear blue water, reefs from 2m-10m depth

Clear blue water,  shallower reefs, healthy vibrant coral

Often clear, but closer to the coast means more chance of poor visibility

Marine life highlights

Reef sharks, turtles, reef fish

Dense reef fish schools, anemone reefs, Moken culture

Reef fish, good for first-timers

Best for

First Thailand trip, bucket-list experience

Quieter alternative, families, repeat visitors

Kids, short stays

Season

15 October to 15 May (park open)

15 October to 15 May (park open)

Year-round is possible, but sea conditions are better from December to April

Trip length

Full day

Full day

Half day or shorter day
Snorkeler exploring shallow coral reef at the Surin Islands, Thailand

How to choose

  • This is your only day in Thailand and you want the classic experience? — choose the Similan Islands. It’s the most famous snorkeling destination on this coast for good reason.
  • Already snorkeled the Similans, or prefer a quieter day with fewer boats? — choose the Surin Islands with it’s shallow healthy reefs and fewer crowds.
  • Traveling with young kids, or only have half a day? — choose local Khao Lak snorkeling, or join family members on a local dive trip as a snorkeler.

Unsure? — Contact us and tell us your group’s swimming ability, how many days you have in Khao Lak, and what you most want to see. We’ll recommend the best fit.