@BenMoore Tweeted this to you previously but if you get a chance the Mario Kart tour is a great way to see the city and the most awesome thing I've done in any country!
https://www.facebook.com/maricar.jp/
Also, if you get to go to Yokohama, the cup noodle museum is fun. Make your own and take it home!
You'll have a blast, happy you got to go!