Along the road to Khong Jiam you can cross the Pak Mun Dam to Kaeng Tana National Park (อุทยานแห่งชาติแก่งตะนะ). After circling thickly forested Don Tana (Tana Island), linked to the mainland by two long suspension bridges, the Mun River roils through the park's beautiful namesake rapids (which is underwater in the rainy season) and passes below some short but photogenic cliffs. Towards the end of the dry season large naturally eroded holes in the rock emerge.
There are several good short walks from the visitor centre: the 1.5km clifftop trail to Lan Pha Phueng viewpoint is especially serene. Nam Tok Tad Ton is a wide and lovely waterfall in the far south of the park, just 300m off the main road.