People: Just steps from the Boom Boom Room, a 4-ft.-deep rooftop pool welcomes the scantily-clad, while AstroTurf pads well-heeled feet. Tip: Forgot your suit? Buy a bikini at the vending machines.
People: Studio 54 may be gone, but classic clubland style lives on at this ultralounge. With glass-walled staircases and crystal chandeliers, M2 is so blinged-out that even Mariah Carey parties here.