I would probably get a day room at a good hotel to be able to relax in comfort. For me a swimming pool and good spa facilities would be a requirement. Then I would walk around for a while in the area of my choice, and have a nice meal at my hotel or at a good restaurant in the vicinity.

I would not try to see or do too much in such a short period of time. Save that for a time when you can stay longer and enjoy a proper introduction to Tokyo.