In the lush forest of the 550-sq km (210-sq mile) Erawan National Park, the nearest park to Kanchanaburi, are the stunningly beautiful Erawan falls , which drop through a series of cascades and shady rock pools. While park rangers still find occasional tiger prints, visitors are more likely to see pig-tailed and rhesus macaques, and some 80 bird species. The Visitors’ Center offers a slide show about the park, and there is a pleasant, 2-km (1-mile) hiking trail which climbs up beside the falls. This is one of Thailand’s most popular national parks, and at weekends and holidays it gets very crowded. The large limestone cavern of Tham Wang Badan, situated on the west side of the park, contains many colorful stalactites and stalagmites.