Hilton Union Square Cut through the garage to sneak into this pool

A heated outdoor pool and jacuzzi await in this mega-chain's three towers; the pool's in the third (though you can get there from a sky-bridge from Tower 1 too), and the most direct, least-attention-drawing-route is through the Tower 3 garage -- there're two elevators that'll take you to the 16th floor and let you skip a stroll through the security-camera-heavy lobby, then there's just one key card door that separates you from ultimate relaxation -- luckily there're 1,908 rooms at HUS, meaning you won't have to wait long for someone with the goods, unless they're literally just carrying Jeremy Piven's worst movie, in which case you should probably just wait for the next guy.