Meet the sloths from Amphibian Avenger on Vimeo.
I should have you talk to my cousins Chantee and Chanel- both of them have traveled to Costa Rica!
I was in Costa Rica in 2009! It's absolutely beautiful. We worked on a banana plantation in the middle of nowhere for three weeks, then spent three weeks travelling. We had some close up experiences with sloths (including a baby sloth!) and iguanas, too. Definitely worth a visit.
Raquel,Did you plan that trip through a specific organization?
Yes, I went with International Student Volunteers, but there are a lot more organisations! You could also look into WWOOFing, which I've done before in other countries.
I've heard of WWOOF and know a girl who went to Costa Rica on a WWOOF project. I think Cross Cultural Solutions looks nice, but it's quite expensive.