Splashing in emerald-green pools under Erawan Falls is the highlight of this very popular 550-sq-km park. Seven tiers of waterfall tumble through the forest, and bathing beneath these crystalline cascades is equally popular with locals and visitors. Reaching the first three tiers is easy; beyond here, walking shoes and some endurance are needed to complete the steep 2km hike but it's undoubtedly worth it. Bring a swimming suit (and a cover-up T-shirt if you don't want to be gawked at by more modest Thai visitors), but be aware you're sharing the bathing area with large, nibbling fish, and monkeys have been known to snatch swimmers'belongings. Level four has a natural rock slide and level six usually has the fewest swimmers. If you hit the trail early you can briefly have the place mostly to yourself. You can't take food beyond level two and though bottles of water are permitted, to prevent littering, you have to register them and leave a 20B returnable deposit. Make sure to bring your tripod and some ND filters for long exposure photographies. If you don't have any tripod, there are other ways do get the long exposure effect: from your phone you can take a live photo without moving, and in the options you can select "long exposure". The other way is to take photos with your DSLR without moving, with a 0,5 seconds shutter speed with F22, and without moving. Take 5 or 6 like that, usually 1 or 2 are sharp ;)