The deep gorges of Bhote Koshi and Langtang Khola are thickly forested with rhododendron, oak, maple and alder. The stretch of forest around Ghoda Tabela in the lower Langtang Valley and below Gosainkunda is inhabited by the red panda, a rare and threatened symbol of a healthy Himalayan ecosystem. Other animals, common to these forests are wild boar, Himalayan black bear, goral, grey languor monkey and leopard. The rare Himalayan hony guide has been sighted here and the park is also the home for Impeyan, Tragopan and kalij pheasants among others. Larch, a rare deciduous conifer, is also found in the forest of lower Langtang Valley. Further up, Himalayan tahr, musk deer and snow leopard can be found. The upper Langtang Valley is one of he few known breeding grounds of the bills besides the Tibetan snow cock and snow partridge.

Like other Himalayan nature parks, Langtang has to be explored on foot. There are several possible trails to choose from depending on preference and time available. The langtang Valley is easily approached from Dhunche town and park office, which is a day's drive from Kathmandu. The upper reaches of Langtang can be reached in four days of easy walking; however, it is advisable to spend a few days around the forest at Ghoda Tabela to watch for the red panda. Once above Langtang village and the monastery at Kyangin, visitors can explore the high valley of Langshisa Yala peak and Tsero, Ri. These and other villages of upper Langtang are inhabited by people of Tibetan descent whereas the villagers of Dhunche, Bharkhu and Syabru further down are home to the Tamangs of Nepal's middle hills.