Khao Yai National Park covers more than 2,000 square kilometers of forest and grassland in central Thailand. Over 50 kilometers of hiking and biking trails wind through the long-standing nature preserve, and its many waterfalls include 150m-tall Haew Narok and 20m-tall Haew Suwat, immortalized in the Danny Boyle film “The Beach.” The park also shelters diverse wildlife like bears, gibbons, elephants and hornbills.