So if you take an orchestra to a waterpark, can the violin, viola, cello and double bass players wear string bikini's? All kidding aside; I would be more worried about sun exposure, which can affect a person the rest of their lives. I never could talk my bands into wearing hats or caps during marching practice. I can't tell you how many places I've had frozen off due to sun exposure in my youth. Hey: and when you get a place removed from your nose, it doesn't grow back. I have a neighbor with 1/4th of one side of his head that is gone from cancer.