i spent two weeks in tokyo end of last year cant say i used my time too wisely. spent most of the time bar hoping then hit the clubs till wee hours of the morning. I thought the nightlife was the best part of it lol. (japanese people think im awesome not sure why it doesn't convey the same over here haha) Any time we used a travel guide book was a total disappointment. Kirin Draft is just amazing. Arcades in electric city will drain a good day (so worth it). if you can eat near the fish markets its amazing. catch a sumo or baseball game if u can.
things i wish i knew before i went
1. learn as much Japanese as you can before you go
2. if there is a 9 level porn shop dont go to the top level
3. dont talk to Nigerians
4. dont talk to Nigerians
Get a Railpass before you go.
Miho Museum near Kyoto. Will blow your mind!
Stay in a traditional Ryokan at least once.
Hit the Onsens.
Drink lots of Sake.
Visit the Museum in Hiroshima.
Record the chimes on the trains in Toyko and use them as tones on your phone.
Don't go see the Godzilla statue in Tokyo - total let down.
Eat lots of red bean and green tea ice creams.
Start the mornings with a can of hot red bean drink from a vending machine.
Be grateful, cause the place kicks arse!