I wouldn't suggest staying in Narita, the time needed to travel and the train fee to and from Tokyo would be significant. Also like Laplap said, no cherry blossoms in Nov/Dec, but the autumn leaves may be in full color that time of year. Kyoto in particular will be quite full of people visiting temples just to see these.

It's still hard to narrow down what might be of interest to you, so instead here are some general-purpose links which may provide some information you need:

Japan travel guide - Wikitravel
http://wikitravel.org/en/Japan

Japan-Guide.com
http://www.japan-guide.com/

Japan Youth Hostels Inc.
http://www.jyh.or.jp/english/index.html