Koh Hong Island (Krabi)
from Phuket

The Koh Hong archipelago consists of about a dozen islands, with only the largest island boasting several beautiful beaches. These include Pelay Beach, a beautiful white coral sand beach lapped by waters teeming with tropical marine life.

In the center of the island lies a large lagoon protected by a ring of eroded limestone caves. Since only a narrow inlet allows access to the lagoon by boat, you'll have to wait for high tide before heading inside and enjoying the spectacular scenery.

There is also a short nature trail that you can walk during your stay.