This is the small pool at the bottom of Waimoku Falls. It is actually about 50 feet across and perhaps 15 feet front to back. The water is about 5 feet deep, at the most.

See all those rocks in the foreground? Want to guess where they came from? Uh-huh - up above - 400 feet up. That's why the sign sez it's dangerous. Aaaww, only wimps worry about rocks falling on them, right? Ouch!