Black Sand Beach. Many of the beaches in Maui have warning signs when you enter them, telling you what to look out for at that particular beach. This tiny little beach had more warnings than any other beach I had seen in Maui: riptide, steep shore-breaks, jellyfish, Man-O-Wars, and sharks were all risks in these waters. I was kind of hoping to catch a glimpse of a Man-O-War, but unfortunately for me, and fortunately for the tourists swimming around, there were none to be seen.