NYC is fun no matter where you go... Go to Times Square, see the TRL set... Go to the Statue of Liberty, and the Empire State Building. Just walk the streets, there are great stores, including Virgin, Planet Hollywood, the WWF restaurant, and many more... I advise getting a map, you may need it
My favorite place to go is Yankee Stadium. Usually i just go there to see the Yankees play, it's a really great place. My cousin lives down in Manhatten, and the shopping is unbelievable.