Pailin: See
O'Tavao Waterfall (pronounced like "Ortavao") (take Hwy 57 towards Battambang for a few min past Phnom Yat, then turn off to the right; the turning is signposted, but only in Khmer and only if heading to Pailin; look for a large hoarding with two faded, hand painted pictures of waterfalls; then head for about 6 km up a tricky track that is possibly treacherous during the wet season). Actually a cascade, is a beautiful spot up in the mountains south of Pailin town. Due to its proximity to the source, the water is clean and is popular with the locals for swimming, despite being only knee-deep at best. Like Phnom Yat, it gets busy during public holidays. Motodop there and back is US$7. US$1.
Wat Phnom Yat (atop Phnom Yat, a hill 500 m S of town, the one with the town-dominating Buddha statue). A pagoda well-known to Cambodians. It features a Burmese-style stupa built by Shan immigrants in 1922. It's quite a walk to the top, but fantastic views of the surrounding area can be appreciated at any time of day. Can get extremely busy on Cambodian public holidays. Free.