Here we are with only an example of what I found making ecological tourism inside the protected area of Jericoacoara, natural oasis crossed by the equator line, not far from Fortaleza (state of Cearà, in Northeast of Brazil). Target of eco-tourism where big dunes of white sand go (really go, by wind!) to a tropical sea along a beach already evaluated one out of the most beautiful ten in the world (in a Washington Post's article).
It's also a real Paradise for windsurfing!