Pebas is a little village on the Amazon river, between Leticia and Iquitos. I arrived there thanks to a girl met in Brazil, Carolina who told me about a lovely family who used to host travelers.
Alter do Chao is probably one of the most alternative and hippie meeting point of the Brazilian Amazon. Surrounded by eco-communities, its clear water, free from crocodils (Jakarè) and piranhas allow you to swim. Just be careful to the electric race and to that little fish who enter your penis if you pee in the water!