Be sure to bring your camera to capture the beautiful cascades of Nam Tok Na Muang. If it's raging, you may be able to feel the mist on your face.
To explore this cascade of water, find your way to Koh Samui. There are loads of other things to see in the area, such as Big Buddha Statue, Namuang Waterfall 1, and Hin Ta and Hin Yai.