Going to Corcovado in February w/ a friend who's really into herpatology, reptiles, etc. He is very knowledgeable and although I think it would be nice to have a guide inside the park, I am worried that the guide wont provide any information that he doesnt already know. Does anybody know of a guide/tour operator who specializes in snakes, lizards, etc. If i know this guy well, hes going to want to get up close to the animals...during the day and also at night. Thanks.