All over the island mounting bikes can be rented and are a good way to explore the island while getting some exercise. It stay in Haad Rin you should take not that the exit road traverses over some pretty steep hills that get the better of many cyclist or the brakes on their bikes. There are still some dirt tracks to be found on Koh Phangan leading away from main road, the dirt road provide a fun ride and some rocky obstacles to avoid.