The 2nd day of the tour. I love jacuzzis and hot springs, and even though I don't trust the wild river and all its poo, I chanced it. The river was clear and you could see the bottom and there was fish. No poo.
Natalie, the tour guide said that the thing to do was to jump into the hot water for 3-5 minutes, and then into the cool river next to it for the same. Do this for 3 times each. It was worth it, and I didn't get sick, or mosquito bites, so I guess I was lucky.