awesome! I was in Japan for two weeks last year - def check out the shops in harijuku if you like fashion, the stuff is awesome there - nikes, new balance and lacoste sneaks like you wouldnt believe.
Get some sushi at the TSUKIJI fish market - dont worry about getting up super early to see the market in action, that place is seriously dangerous in the early hours, but you def should eat sushi there, the freshest sushi on earth, have it for breakfast!
Ropongi is the place to wild out if you want to meet some japanese girls who love americans, just watch out for all the jamacans trying to take you to strip clubs
the maid cafe (@HOME) in akihabara sucks, don't do it, unless you don;t mind dropping like 30 bucks on some ice cream and getting ignored. and you can't even take pics. Worthless, but Akihabara has sweet video games.
definitely stay in ryokans, they are cheap and pretty nice
..... Man, I love Tokyo, planning to go back next spring.
We went to Nikko, Osaka, Nara, Mt. Fuji, and a few other places. Nikko and Nara def worth it, Fuji and Osaka, not really.