Belle Reve is a sort of bar/gastropub that's known to turn into a full on party from time to time. The food is good, but the partying is better.

A classic dive on the Lower East Side, 169 Bar is always a fun choice.

Located on the roof patio at the Thompson Hotel on the Lower East Side, hit Blue Ribbon Kanpai Garden with a group for beer slushies and ping pong.

Good Story is the rooftop bar at the Arlo Soho hotel, and, as far as rooftop bars go, it’s a pretty pleasant place to hang with a group downtown.

Rooftop Reds is a big rooftop wine bar in Brooklyn Navy Yard with hammocks and cornhole.

If you're looking for a big spot for day drinking Williamsburg, try Radegast. It can get a little crowded, but maybe that's what you're looking for.