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.

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

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.

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.