Koh Lanta consists of two adjacent islands: Koh Lanta Yai and Koh Lanta Noi. Koh Lanta Yai is full of tourist facilities while Koh Lanta Noi is the location of the district office. Most of the beaches on Koh Lanta Yai lie in the west and offer a wide range of accommodation. These beaches include Kho Kwang, Khlong Dao, Phra Ae, Khlong Khong, Khlong Nin and Ba Kan Tiang, all can be reached by road. Sala Dan Pier in the north is where tour operators, shops and banks are situated.

At the south end of the island is the headquarters of Mu Koh Lanta National Park which offer a camping ground and beautiful views. Travelling to the east of the island, visitors can see an old community of Koh Lanta and a sea gypsy village. Some guesthouses are available. Motorbikes can be rented at Sala Dan to explore the island.