Emerald Pool, Wat Tham Sua, Krabi
The natural hot springs are a popular sight in Krabi. Lots of Thai families are around, so beware that it might be crowded. Other than that, the place looks like fun, especially for kids. The water temperature might be hot, I mean really hot, around 40 degrees celcius in the big Emerald pool (there is also a Blue Pool and Sra Kaew). Entrance fee is THB 200 which is pretty high for Thailand. Good thing is that the water is clean, but it might be a little slippery around.