fringed with dazzling white beaches and kaleidoscopic coral reefs.

The water off the Andaman Coast is clear and calm in December,

which is perfect for snorkelling or diving among marine life large and small.

Green and hawksbill turtles nest in this area between November and February,

and you can see reef fish, sharks, barracuda and rays.

The national park authority runs basic bungalows on Ko Similan and Ko Miang,

and many operators offer day trips to the islands from Khao Lak on the mainland.

But for the best underwater action, join a live-aboard dive boat from Khao Lak or Phuket.

Prices rise towards Christmas, so try to book earlier in December for cheaper deals

to experience some of the world's best diving.