How do I get to the small island off Phatt Island?


Hint 1 of 14:
The entrance to that island is rather hidden.

Hint 2 of 14:
It's behind the waterfall.

Hint 3 of 14:
Did you walk up to the hill behind the waterfall?

Hint 4 of 14:
There's a pump there.  Perhaps it has something to do with the waterfall.

Hint 5 of 14:
Try turning the pump off.

Hint 6 of 14:
Too bad you don't have a wrench.

Hint 7 of 14:
Or a monkey wrench.

Hint 8 of 14:
But you can make one.

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