This is the shortest nature trail and the easiest to trek. It is suitable for visitors of all ages. It skirts rainforest alternating with dry forest in excellent condition. All along the trail is valuable agarwood with the refreshing scent of a fire. Animals encountered might include the Lar gibbon, pileated gibbon and various birds. At the end of the trail is Kong Kaew Waterfall, with the refreshing cool of a forest stream from volcanic rock and freshwater swamp forest, both photogenic and educational.

This nature trail links two waterfalls, following Lam Ta Khong stream and alternating between bamboo forest and dry forest at intervals. Along the trail you will hear the thundering sound of Pha Kluay Mai Waterfall during the rainy season. However, when water levels drop in the dry season, you can see the traces of lava flow from a volcano hundreds of millions of years ago. Also there are Polypleurum flowers, a newly reported species, sprouting between the rocks, along with Renanthera orchids (“Whai Daeng”), which give the waterfall its name from the white and red blooms appearing around the waterfall during April.

Many species of animal can be found near the water course such as butterflies, water dragons and otters, with groups of gibbons in the trees, hornbills and hawks foraging for food. At the end of the trial are rock platforms in the stream which are only visible during the dry season.

This nature trail highlights a variety of different forest types – mature dry forest, secondary forest and grassland. The trail is shaded by tall trees throughout its length such as banyan and java plum. Their delicious fruits attract many birds and animals to make a “restaurant for wildlife”. There are giant basil trees which are unique to the Dong Phaya Yen complex. It is also a foraging trail for elephants and gaur, so you may come across their tracks or dung. You might see a pair of hornbills making a nest in a tree hollow, or gibbons swinging around gathering fruit. When you arrive at the Nong Phak Chi Observation Tower, you can see many kinds of animals near the water sources and salt licks in the grass such as elephants, gaur, gibbons and hornbills.

This one-way trail leads to Sai Sorn Reservoir, a beautiful spot to watch the sunset. The trail goes through dry and secondary forest which is the habitat of the Lar gibbon. The rainy season brings out a beautiful array of flowers such as balloon plant, begonia and mossiata. The highlight is a giant Biang tree which is centuries old. The secondary forest is relatively open with the chance to see many birds such as blue-eared barbet, stripe-throated bulbul, black crested bulbul and green-billed malkoha.

This trail starts in the same place as Trail No. 4. It is a nature study trail encountering a diversity of forest types such as mature dry forest, secondary forest and grassland, and alternates between a flat basin and steep paths up and down hills. The highlight of this trail is a giant Baing tree which is centuries old. In the rainy season you may see wild mushrooms in bizarre shapes and bright colours. This trail is a foraging ground for many animals such as elephants, bears, hornbills and gibbons. The last portion of the trail leads to Nong Phak Chi Observation Tower where you can watch animals large and small coming out to feed by the water in the grassland, and may encounter elephants, gaur, gibbons, hornbills among many others.

This nature trail is a big nature lesson and a rather long distance. The forest on the way is both rain forest and dry forest interspersed with bamboo groves. Many plants to see on the way include Siamese rosewood and scented agarwood. There are also dense thickets of large ferns and abundant animals such as elephants, gibbons, Asian black bears and hornbills. It is a challenging trail with many twists and turns, and a foraging trail for wild elephants, so the route may be confusing, and this is why it is necessary to have an experienced trail guide.

Khao Yai National Park’s latest trail celebrates the long and friendly relations between Thailand and the USA. Besides having markers of the historic relationship, the trail also follows the standards of the USA’s national parks through the Sister Parks Arrangement for Resources and Knowledge Sharing (SPARK). The trail takes in different ecological zones such as dry forest, secondary forest and grassland. Frequently encountered wildlife include the Siamese Fireback, silver pheasant, gibbons and hornbills