What should you always do when you come to a strange place?
Hint 2
Explore!
Hint 3
Herman Toothrot will show up in various locations.
Hint 4
It's well worth your time to talk to him.
Hint 5
There are also many memos and notes all over the island.
Hint 6
Read them.
Hint 7
Here is what you are supposed to understand after exploring and reading: LeChuck is keeping Elaine in the Monkey Head. Herman has the cannibals' monkey head key, but he won't give it back because they won't return his banana picker.