[R3dliner]

Unfortunately the best pizza is in Brooklyn & Queens but most pizza spots in the city are decent.
One day is not much but as people mentioned def visit the freedom tower but if times limited at least check out the empire state building observation deck.
Plenty of rooftop lounges at night to get some drinks and great views. Press lounge(west side), 230 fifth(midtown), Mr. purple(downtown)
Can also bar hope if you walk around LES(lower east side) or by McDougal st area.
If you're into street food I highly recommend halal guys on 53st and 6th. Always a line at nights. Killer late night munchies after drinking.