✔ 最佳答案
Try your best to learn some Japanese before you go so that you can communicate with the local people.
The best time, in my opinion, is from Mid-September to November. You may have to go to Hokkaido first in order to avoid the typhoons in Honshu during September and October.
Spend at least one week in Hokkaido - Shiretoko Peninsular in the east and Ribun Island in the north is a must go. They are beautiful.
Spend about two weeks in Honshu Island, Yokohama is another must go where you can visit the Chinatown, museums etc. If the schedule suits, enjoy one of the JPOP concerts in Yokohama Arena.
When you are in Kansai, go to Tottori and visit one of the three wonders of Japan while you are on your way to Tottori.
Spend a couple of days in Shikoku if you can afford the time, although it's comparatively backward you can have good feelings of olden Japan.
Spend about a week in Kyushu to see the volcanoes, Mt Aso and Nagasaki are must go.
Youth hostel provides the cheapest accomodation. They are clean and renders you the opportunity to meet a lot of Japanese boys and girls, especially in September before the start of the university term. They are generally very helpful but you need to know some Japanese in order to communicate effectively with them.
I usually refer to a little book on railway timetable published monthly in Japan while I planned my journey. I remember it costs about 1500 yen and its available at the newsagent in Japan.
Enjoy yourself whilst planning.