Better tan at the beach or my backyard? why?

UV rays reflect off of the water and sand at the beach. So, keep in mind that though people prefer to get tans at the beach because of this reason, they also tend to burn quicker than normal. Because of cool air coming off of the water and being able to sit in cool water people are sometimes unaware of a burn. An overexposure to UVB rays causes this burn and if really bad will begin to break down DNA.