Sunday afternoon at Battery Park Book Exchange is always a solid vibe, and the champagne bar situation makes it feel a little fancy without trying too hard. Parker's Back at 3pm gives you time to get home before the work week hits. The weekend door policy leans 21-plus according to some regulars, so if you're bringing younger folks aim for Thursday or earlier in the week when the bookstore-bar vibe stays all-ages friendly. First come first seated means showing up early scores you one of those leather chairs on the second floor before the jazz sets fill the room.