Topfree (topless) sunbathing is technically legal in Hawaii EXCEPT at STATE park beaches, but these are few in number as most beaches are county or undeveloped. The Hawaii obscenity code is in the Hawaii Revised Statutes (H.R.S.) at 707-734. No mention is made of bare breasts. In fact, although intolerant cops will ticket or arrest at high visibility beaches for total nudity, if the sunbather is not INTENDING to AFFRONT (offend) a passerby, and is in no remote way lewd, it is technically legal. So, while you can sunbathe topfree on busy Waikiki, total nudity there would probably get you ticketed, or even arrested. Girls do indeed go topfree at Waikiki, mostly European or Australian, although they are a minority. On the way to Diamond Head, walking from San Souci Beach which is the farthest east end of Waikiki (ask when you get there) on the right is a small county park with a couple of benches and shower. Forget the name- begins with "m". . From Sans Souci Beach only 5 minute walk. This is a local topfree hangout. When I was there in early May 2005 one girl was even nude. The beach is very narrow and at high tide you can get washed out. North Shore Oahu beaches, like at the surfing places Pipeline, Sunset Beach, etc., see more topfree use as the crowd is more international. But Big Island, Maui, and Kauai are the islands to go to for getting rid of tanlines.