Escolinha Itacotiara is a little school in the Amazon. You are offered to stay there for free, if you help to teach the local children. It´s a small and new project, so you are welcome to introduce your ideas!
My brother left his job last year to construct this little place. Off course this project will only be a success, if there are constantly travellers coming... So:
If you are interested, or know someone- please spread the idea!!