Walking & Waterfalls
Walking
The mountainous jungle interior of the island offers some challenging and enjoyable walking. Several people on the island act as guides and due to the demanding terrain and bad paths it's probably worth taking a guide unless you're an expert. Lek from Jungle Way in Klong Son takes people on interesting treks to the jungle interior, and can arrange overnight treks as well (call him on 089 223 4795 or 089 247 3161). Ko Chang Evolution Tour offer guided Safaris.
There is a recently-completed Mangrove Walkway near to Salak Kok on the East of the island. You can take a 15 minute stroll through the mangrove forest on a raised walkway. The Mangrove is interesting but the walkway has sadly been built entirely out of concrete.
Waterfalls
The following waterfalls are free to visit and there is usually plenty of water from July to December. They may dry up after this though so ask around for the latest information. Klong Nonsi waterfall is close to Dan Mai on the eastern side of the island. It has several tiers, The first is a ten minute walk into the jungle, and at the top there is an inscription made by King Rama V. There are two waterfalls, Klong Neung and Khiri Phet near to Salak Phet in the southeast of the island. Both are clearly signposted. There are also smaller waterfalls up the valleys behind Klong Son, White Sands Beach and Kai Bae. Ask locals for directions.
There are also national park administered waterfalls at Klong Plu near Klong Prao village and Than Mayom near to Dan Mai village. If you are a foreigner you will be charged an entry fee that has just risen from 200 to 400 Baht. Under Thai law this fee rise is not due to take effect until November 30th 2007 so it is something of a mystery that it has already taken effect on Koh Chang. Thais pay 40 Baht.
Evolution Tour offer guided Waterfall Safaris that can be arranged by calling 089-603-9642.