Established in 1990, this marine national park protects 16 islands in the Ko Lanta group, including the southern tip of Ko Lanta Yai. The park is increasingly threatened by the runaway development on west-coast Ko Lanta Yai, though other islands in the group have fared slightly better.
Ko Rok Nai is still very beautiful, with a crescent-shaped bay backed by cliffs, fine coral reefs and a sparkling white-sand beach. Camping is permitted on adjacent Ko Rok Nok with permission from the park headquarters. On the eastern side of Ko Lanta Yai, Ko Talabeng has some dramatic limestone caves that you can visit on sea-kayaking tours (1300B). National park fees apply if you visit any of the islands. Ko Rok Nai, Ko Rok Nok and Ko Haa are off limits to visitors from 16 May to 31 October.
The national park headquarters and visitors centre are at Laem Tanod, on the southern tip of Ko Lanta Yai, reached by a steep paved road. There are some basic hiking trails, two twin beaches and a gorgeously scenic lighthouse, plus camping facilities and bungalows amid wild, natural surroundings.
