Research and eat at all of the top restaurants there are amazing and no where else in the world rivals the quality of NYC restaurants. Il tinello located on 53 and 5? i think my personal favorite. Hit up the four seasons. Sparks steak house. Peter lugar steakhouse. Tons of others.
Braodway show is pretty cool im not a huge fan of them though. Just walk around crusing the city is awsome. Nightlife is pretty dam fun. Living here my whole life i cant really see it as a tourist destination since its not really a big deal for me just hop on the train and head on in