Nam Wa River white-water rafting is the main adventure activity of the Mae Charim National Park and is considered one of the hardest and most enjoyable white-water areas in Thailand. The difficulty ranges from Level 1 all the way up to Level 5 depending on the season. The difficulty of rapids is at Level 3-5 during June to October, at Level 3-4 during November to February, and at Level 2-3 during March to May. The suitability of the different parts of the river is also dependent on the season as well. The upper portion of the Nam Wa River is more suitable for rafting during the cool season after which the water level drops and surfacing rocks become obstacles to the inflatable rafts. The middle part of the Nam Wa River is suitable during October to February while the lower portion of the river is suitable all year round. The Nam Wa River is about 100 km long making it impossible to journey down the entire river in one go. The rafting route is therefore split into three areas as follows: