Popular activities in the park include butterfly and bird watching, animal watching and trekking. The Park has numerous butterflies and birds as surveys indicate that over 293 species of birds use KhaoYai as a feeding ground while KhaoYai is the habitat of over 200 species. In addition, the park is home to an abundance of wildlife. The most frequently spotted animal is the deer that grazes on grass plains and sometimes come to be fed around the park office. Other animals spotted include elephants, sun bears, wild boars, monkeys, tigers, gaurs, and mountain goats. To facilitate animal watching the park built 2 wildlife watchtowers at Mo Singto and Nong Phak Chi. Visitors are allowed up there between 8 a.m. and 6 p.m. In addition, those who want to go on a night safari by car must contact the park office before 6 p.m. Moreover, KhaoYai has over 20 trekking trails for visitors to choose from, each different in natural beauty and distance. While some trails like the Kong Kaeo trail and the Kilometer 33 trail (Thanarat Road-Nong Phak Chi) take 1-2 hours to complete, other trails like the Nang Rong-KhaoYai trail, Samo Pun trail or KhoYo 4 Unit-Wang Heo waterfall trail require overnight stays. Information and guides can be obtained from the tourist service centre.