If you want to do an Eco-Tour and some bird watching try this one:
http://www.pepeshideaway.com/activities.phpPepe is an American and Former US Navy Corpsman retired and operates this very nice and reasonable resort. You don't need to stay right on the ocean but it can be arranged but the off ocean rates are the best. Check online for airfare there is always a deal to be had!
You can never be assured that you will actually "see birds" and the one advertised in Brazil is so expensive over 6,000 each plus airfare for the last one I checked into. That's why I went to Pepe's and did so much more! There is something for everyone, fishing, bird watching, mountain climbing, volcano's etc...
Two of us went for a week including airfare & meals from Detroit Michigan and cost us less than 3,000