We (a small Group of three persons) were in Corcovado in November 2012 (not in 2015) for 2 days and one night at the sirena station. Allan was our guide. He grew up in Bahia Drake and know his territory very well. He will give you a lot of interesting Information, and if you don't speak english very good, no problem, he will take the time to explain! Thanks to Allan, we saw a lot of different animals. We highly recommend his service if you want to see the fauna and flora in Corcovado national parc with a domestic guide who loves and protect this beautiful nature.
Thank you very much for your comment. I hope to see you again in Drake Bay.