You'll have a blast in NYC...there's a million things to do. Check out the Greenwich Village and Soho area, if you can. Ask your concierge or cab driver for details. TONS of places to eat, shop, drink, browse, dance, live music, people-watch, etc.
Of course you should see the Statue of Liberty, and the Empire State, which unfortunately is once again the tallest building in NYC.
Have fun!
Mike