Polo Beach is on the north side of the island. It's kind of difficult to find without good directions and it's not visible from the road. There aren't any restrooms, etc. When you walk down the trail it says no nudity, etc. but no one pays attention to that. To the right of the trail is the unofficial nudity side. To the left is the non-nude side, though those that don't mind nudity can go to the nudity side. We were there twice when on Oahu last August. It's awesome.