Wildman Steve Brill
I was watching Getaway last night and this guy was on it, he takes tours around Centeral Park and shows people all the edible plants and stuff. I thought you might be interested, becasue you want to spend a lot of time in the park, and this will probably help you learn heaps of about it and get to know it in a different way. Tours arnt too expensive, they're about $13 USD and go for a couple of hours. He looks like a bit of a character.