yeah check out the brooklin bowl. its a pretty cool venue that showcases local bands every night.
also there is nothing cooler then walking around times square at four in the morning piss drunk. its a totally different vibe then during the day.
there is also this sweet spy museum. i know it is a very touristy thing but its still worth checking out.
hanging out hopping subways was a weird yet fun way to pass time during the night
look up what concerts playing too. NYC has an awesome music scene with major headliners almost every night. also most of the local bands are really sick too.