Can be done all around the island. There is a trail that leads between Haad Rin and Haad Tien, which many enjoy. The route can become difficult to discern, and bringing enough water is necessary. If you are feeling adventurous, ride a motorbike to the end of the concrete road at Haad Khom from where you can hike through steep terrain and jungle on the coast to isolated Bottle Beach. The overgrown and difficult trail is occasionally marked with bottles and the hike takes 2–3 hours. Ride back to Chalok Lam with a taxi boat (150 baht/person) from where it's a 30-min walk uphill to the Haad Khom main road where you parked your motorbike (or you can hike all the way from Chalok Lam). Another good trail is to the best viewpoint on the island (in good weather), Khao Ra Viewpoint, on the highest hill on the island.