Twirl above the clouds on the city's highest dancefloor. Friday and Saturday evenings, a full jazz band plays; Wednesdays and Thursdays have live piano music. Genteel mayhem ensues at Sunday Champagne brunches, but evenings are romantic – and it's often empty at sunset. Cover is free for hotel guests and before 8pm weekdays. Martinis run $15+, but these views are priceless.