One normally does not like to talk about a toilet bowl, but this is an exception. This Toilet Bowl is a natural phenomenon near Hanauma Bay. The Toilet Bowl is a is a natural pool formed by centuries of waves beating against the lava rocks at the bay. Waves force sea water into the pool through a hole in the lava rock. The water is then sucked back out through the same hole, creating the "flushing" action similar to toilet bowls.
DO NOT ENTER THE WATER OR THE POOL. IT IS VERY DANGEROUS AND PEOPLE HAVE DIED IN THE BOWL. Enjoy this pool from the safely above the pool. The cache is located well away from the pool and in a safe location.
I would recommend not going to the Toilet Bowl from Hanauma Bay. Use the trailhead waypoint and that will get you there safely. Again, DO NOT GO INTO THE BOWL, it is NOT SAFE. I do not care if you know someone that did it before, or have seen a video of someone doing it and it looked like fun, be smart and enjoy it from the safety of, well NOT IN THE BOWL!