How do I get the Monkey Head key

Hint 1 of 9:

You'll have to give the cannibals something they would like.

Hint 2 of 9:

Have you been near the monkey head yet, past the fence?

Hint 3 of 9:

Maybe they'd like something to offer to the head?

Hint 4 of 9:

That wimpy little idol looks nice.