A trip to Krung Ching, a nine-tier waterfall on the north side of the park, makes for a highly satisfying day out with a nature trail taking you through dense, steamy jungle to the most beautiful, third tier. Starting at the Krung Ching park office, which lies 13km south of Ban Huai Phan, this shady, mostly paved, 4km trail is very steep in parts, so you should allow four hours at least there and back. On the way you’ll pass giant ferns, including a variety known as maha sadam, the largest fern in the world, gnarled banyan trees, forests of mangosteen and beautiful, thick stands of bamboo. You’re bound to see colourful birds and insects, but you may well only hear macaques and other mammals. At the end, a long, stepped descent brings you to a perfectly positioned wooden platform with fantastic views of the 40m fall, which used to appear on the back of thousand-baht notes; here you can see how, shrouded in thick spray, it earns its Thai name, Fon Saen Ha, meaning “thousands of rainfalls”.