Vieques is a great place to go birding!
The Vieques Conservation and Historical Trust hosts six bird walks a year, and you can join them for free. Bring your binoculars, wear your mud shoes, and come learn about the birds of Vieques.
Vieques also hosts an annual Christmas Bird Count, so if you are really into birding, plan your trip for the week right after Christmas. See the "Birding" link at the top of this page (and every page) for more information about birding on Vieques!