One of the outstanding natural treasures of the region, the 72,000-hectare Cat Tien National Park comprises an amazingly biodiverse region of lowland tropical rain forest. The hiking, mountain biking and bird-watching are the best in Southern Vietnam. Always call ahead for reservations as the park can accommodate only a limited number of visitors. However, a word of caution, visitors rarely see any of the larger mammals resident in the park, so don’t come expecting to encounter rhinos and tigers.