Ton Sai and Bang Pae Waterfalls, located in the Khao Phra Thaeo National Park, these waterfalls, at 18 metres high, are the tallest on the island. Combine a visit to the falls with a tour of the park and see the Gibbon Rehabilitation Centre, where gibbons captured as babies for illegal aspects of the tourist trade are gently reintroduced to their natural environment. Near the falls are a restaurant and several kiosks selling inexpensive snacks. Take along a bottle of wine and make a picnic…