The parking lot has frequent car break-ins while you're underwater or whale watching. Screwdriver entry. I've dived here roughly 100 times, got robbed 3x. The walk down to either entry point is a little challenging. Entry/exit west of the parking spot is medium-hard. Entry on the East outcropping is very challenging, and should not be attempted without watching other divers do it first. There's a broad set of tunnels under the East entry point. DO NOT GO INLAND through those tunnels, because of whitewater surge. Going west thru the tunnel's OK. Avoid the silty cave near the east entry. There's a (narrow) tunnel near the exit-point, as well. The 90 minute drift dive into Hanauma Bay / toilet bowl is strictly for the most advanced divers, and there's no way to quit en route, so avoid that until you have great experience there. Straight out on the main point is a shallow shelf that always has humpback cowries.