If I was to pick only one town in Tokyo, I would choose Ginza. It is a place where adults go.When I was young, long time ago, I used to go to Shibuya, Roppongi and Omotesando all the time. But now, I would pick Ginza. So many places to eat and drink. I have to list up for you!
In Fukuoka, my home town, have many Yatai restaurants. (Street Foods Restaurant)
If you have a chance to come to Tokyo, find a nice Ryokan to stay for one night. You can go to Izu or Shizuoka or many other places to find Onsen, the hot springs. It is like an Inn breakfast and dinner all included.
Foods taste wonderful.