The Kuang Si Falls just outside Luang Prabang in Laos are really beautiful, even during the dry season when I went. The falls cascade down through the hills leaving small pools behind, created by the calcium in the water (that also gives the water a bright blue color). You might expect the water to be somewhat warm, but its rather bracing, especially when you’re not expecting it!
If that’s the dry season, it must be stunning during the wet one!
I talked to some people that had been there before and they said the amount of water flowing over the falls in the wet season was amazing. Maybe I’ll have to go back and see it.