Originally Posted by
5khours
If at least one of you is a female, I would suggest hitchhiking between Tokyo and Kyoto.
That is some excellent, quality advice. You could also walk the streets of Roppongi (Or, if you are male, Shinjuku Nichome.) and solicit inebriated salarymen for extra spending money, and get them to pay for your hotel room (There are no STDs in Japan! They were outlawed, along with handguns.)
Oh, and just leave your passport in a locker at the airport. No need to carry that cumbersome thing around with you.