Mae Yom National Park

Attraction Details :

This national park takes on mountaineous terrains with teak forest. Along the Yom river in front of the camping area lies Kaeng Suan Ten rapids, a two-kilometers long stretch of rock formations best visited in November-February.
Getting there: The park is located in Song district 48 kilometers from town. Be noted that Kaeng Sua Ten closes on 1 May – 31 October.

http://www.tourismthailand.org/See-and-Do/Sights-and-Attractions-Detail/Mae-Yom-National-Park--4245