THE ROOFTOP AT GANSEVOORT MIAMI BEACH You can sunbathe by day and listen to DJs by night at this rooftop lounge, perched 18 floors above the beach. In the warmer months, the space hosts the RX Pool Party, an adults-only soiree that runs from noon until 8 p.m. each Saturday. (Even if you don't plan to get wet, it's worth a dip in the pool to hear the Gansevoort's underwater music system for yourself.)