If you go on a boat trip you can ask to stop at monkey beach (there's more than one) this one is one of the little beaches that sits at the bottom of the main cliff that forms the back bone of the island, where all the speed boats are parked.
Quite sad and pathetic to be honest. Watching grown adults laugh hysterically as they hand monkeys cans of coke to drink from. It was hard to know who had evolved least looking at the tourists and the monkeys!