Hi, I've been to Japan and travelled a week, trips are expensive but you can save money by spending the nights at internet cafes, instead of hotels... they are cheap and although there are no beds thera are confortable chairs, and if you pay a little more you can take a shower, some places even provide towels and shampoo......
Kyoto is a great place, but you cannot miss Tokyo (there's a place called Roppongi, very cool)....
