Similan Islands Dive
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Similan Islands Dive

Thailand's underwater paradise for serious divers

The Similan Islands aren't just another dive spot in Thailand — they're the reason serious divers make pilgrimages to the Andaman Sea. Nine granite islands rising from crystalline waters, each surrounded by some of the most pristine coral reefs you'll find anywhere in Southeast Asia. But here's the catch: you can only visit from mid-October to mid-May, when the monsoons give way to gin-clear visibility and calm seas. The Thai government shuts down access during the rough season, which means when the islands do reopen, the marine life is absolutely thriving. Whale sharks cruise the deeper sites, manta rays glide over cleaning stations, and the hard corals have had months to recover from any tourist impact. This isn't beginner territory — strong currents and deeper sites mean you'll want your Advanced Open Water certification before you arrive.

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You can't actually stay on the Similan Islands themselves — they're a national park with strict overnight restrictions. Most divers base themselves in Khao Lak, about 90 minutes south of the islands by speedboat. The town has everything from budget guesthouses at 800 baht per night to luxury resorts like The Sarojin that'll run you 15,000 baht. Look, Khao Lak isn't winning any beauty contests — it's a functional dive town that got rebuilt after the 2004 tsunami. But that's exactly why it works. Dive shops line the main road, restaurants serve proper Thai food (not tourist versions), and you can walk to everything you need. Book something within walking distance of Nang Thong Beach if you want to decompress between dive days. The beachfront gets busy, but head 500 meters north or south and you'll have stretches of sand to yourself.

Money-Saving Tips

  • 1.Book dive packages in advance online for 10-15% discounts compared to walk-in rates
  • 2.Stay in Khao Lak rather than expensive Phuket resorts — you'll save 3,000+ baht per night
  • 3.Eat at local Thai restaurants instead of hotel dining — meals cost 150-300 baht vs 800+ baht
  • 4.Join group dive trips rather than private charters — splits the boat cost among 15-20 divers
  • 5.Bring your own mask and fins to avoid 200 baht daily rental fees
  • 6.Book liveaboard trips during shoulder season (November or April) for 20-30% savings

Travel Tips

  • •Get Advanced Open Water certification before arriving — many sites require it due to depth and currents
  • •Pack seasickness medication even if you don't usually get sick — 2-hour boat rides in swells are different
  • •Bring a reef-safe sunscreen — regular sunscreen is banned in the national park
  • •Book accommodation within walking distance of Nang Thong Beach for easy access to dive shops
  • •Download offline maps of Khao Lak — WiFi can be spotty and you'll need directions to dive shops
  • •Pack a warm layer for early morning boat departures — it gets surprisingly cool at 6 AM
  • •Bring a waterproof bag for your phone and valuables during boat transfers
  • •Check your dive insurance covers Thailand and depths up to 40 meters before traveling

Frequently Asked Questions

Not for all sites, but highly recommended. Many of the best sites like Richelieu Rock and the deeper walls around Koh Bon go to 25-40 meters with strong currents. Open Water divers can access the shallower reef sites around Koh Miang, but you'll miss the whale sharks and manta rays that frequent the deeper sites.

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