What to see and do?
Highlights of the national park are enormous caves called Tham Than Lot which means a cave where a river flows through. It is less dangerous than the recent world-famous Tham Luang in Chiangrai.
Actually, there are two caves; Than Lot Noi and Than Lot Yai. Than Lot Noi Cave is about 300 meters long and 10 meters high. A 2.5-kilometer nature trail from this cave leads to the larger Than Lot Yoi Cave.
Estimated hiking time is 3 hours. It is believed that in the ancient time people lived there as many skeletons were found. Than Lot Yai Cave is 60 meters wide.
Visitors must register before and after visiting the caves, and they have to leave the cave before 16:30. In addition, they should be in good health, and they should not touch anything in the caves.
Besides the splendid caves, there are also scenic waterfalls such as Tri Trueng Waterfall and Than Ngoen. The former one is actually on the nature trail from Than Lot Noi Cave to Than Lot Yai Cave. The
magnificent Tri Trueng Waterfall is 1.5 kilometers from Than Lot Noi Cave. It cascades through three levels whereas Than Ngoen Waterfall flows down seven levels.
The rich forests of the national park are also home for many kinds of wildlife and a variety of plants. Bears, Serows, Northern Red Muntjac, Asian Elephant, Pheasants, and Partridges can be found here.
Chalerm Rattanakosin National Park opens daily from 08:30 am to 16:30 p.m. Admission fees for foreigners are 200 baht for adults and 100 baht for children. Accommodations, campsites, toilets,
shower rooms, food shops are available there. However, food shops open only on weekends or a holiday.