...visit this link...
hike La Amistad!     
We can provide contact info for local guides for hiking trips into the remote primary tropical forest of La Amistad International Park.
Use of a knowledgeable guide, basic equipment, and creative planning can provide the opportunity to see more, including nocturnal life in the higher-altitude forests. We believe in treading lightly and leaving no trace - our aim is to allow the full enjoyment of one's surroundings and to preserve biodiversity.

P.S: I recommend:
Costa Rica Travel Guide.  Explore Costa Rica at
http://www.savethemanatee.com/CR

Site includes photo tour, tips, itinerary, and updates.