An awesome, and sometimes free, ferry that links Manhattan at the Financial District to Ikea in Brooklyn via Red Hook. Very great views of the city and if you end up having to pay it's redeemable for a monetary discount towards an Ikea purchase. I think of it as a treat and an investment.

The Franklin D. Roosevelt Four Freedoms Park is a four-acre memorial to Franklin D. Roosevelt designed by Louis Kahn that celebrates the Four Freedoms Roosevelt articulated in his 1941 State of the Union address.

The first museum in the United States dedicated exclusively to posters.

The amazing sidewalks across the street from the New York Public Library.

Webster Hall is a solid venue, and a frequent stop for many great bands on their rise to glory. If you've only got a few nights in the city, chances are a great act will be playing here.