A World Heritage Site designated as a biosphere reserve, Cat Ba National Park is home to 32 species of mammals, including majority of the 65 remaining golden-headed langur, the most endangered primate in the world. Seventy species of birds and more than a thousand plant species have been documented in the park, including 160 with medicinal value.

There are some excellent hiking trails on the island, including an 18-km route that leads to a mountain peak. Most hikers stop by the kiosks in Viet Hai, a minority village where snacks and lunch are served. Having a guide is not imperative but is recommended so you can make sense of the verdant canopy of trees. Most tourists actually prefer to explore the park on organized tours. You’ll get to explore its natural beauty highlighted by caves, limestone forests, cascading waterfalls, and small streams flowing to the sea.