A calm beach base for Similan boulders, Surin reefs, and Richelieu Rock
Updated Jan 23, 2026 • 12 sources
Top species linked to approved dive spots in Khao Lak (Similan and Surin Islands).
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Last updated: January 23, 2026 • 12 sources
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Overview
Khao Lak is the laid-back mainland base on Thailand's Andaman coast for reaching two headline marine parks: Mu Ko Similan National Park and Mu Ko Surin National Park, including the iconic Richelieu Rock. Expect granite boulder playgrounds, coral walls, and pelagic surprises like manta rays and occasional whale sharks, with water often around 26°C to 29°C during the open season. Diving works either as fast day boats from local piers or as multi-day liveaboards that stay in the islands for early starts and calmer sites. Plan around the annual park closure in the southwest monsoon (typically mid-May to mid-October), when sea conditions shut down most Similan and Surin trips. On land, Khao Lak stays mellow: long beaches, easy food options, and simple day trips to rainforest waterfalls, Phang Nga Bay, and Khao Sok.
Base on the mainland and day-trip or liveaboard into Mu Ko Similan National Park and Mu Ko Surin National Park, depending on the season.
Khao Lak is a practical gateway to Richelieu Rock, one of Thailand's most celebrated sites for schooling fish, macro life, and occasional big-animal days.
Choose fast day boats for a single highlight or a multi-day liveaboard to string together Similan boulders, Koh Bon ridges, Koh Tachai pinnacles, and Surin reefs.
Long beaches, easy dining, night markets, and quick access to waterfalls and rainforest make it an easy base for mixed groups.
Trip Planning
External Booking PartnerThis destination works either as a land-based plan or as a longer liveaboard itinerary. Use the guide for local planning, or compare boats if the remote circuit is the priority.
Land-based guide
Base areas, day boats, local operators, and shore logistics
Liveaboard planning
Boats, departures, and longer expedition-style routes
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33 linked spots
Best time to go
November to April
Drier weather, calmer seas, and the best chance of clearwater days offshore.
Main caution: Southwest monsoon brings heavier rain and rougher seas. Offshore marine parks are typically closed.
