This is my first post, so bear with me:
I am going SIN-NRT-JFK on JAL. Because of limited availability of award tickets, I arrive at NRT on 4.30 PM on 7/18 and then leave at 7.05 PM on 7/19. I want to see Tokyo, but from internet searches I don't really get a feeling what I can do in a short amount of time. Also, do any of you know of any good, somewhat affordable places to stay?

Thanks a lot!!