Eco-Tourism
Koh Phangan has been officially designated as a zone for eco-tourism, so if you are planning to visit make sure that you join in. There are plenty of activities such as doing a local trek up the highest mountain or beach hopping along the east coast - check out the trekking section.
For those that need a bit more speed pick up a mountain bike for around 100 Baht per day. See for more information on recommended routes.