Winter Sports
You can enjoy ski&snowboard in Japan,you know?
Especially,Hokkaido,Niigata and Nagano are well known in east Japan between Japanese.
I love the ski resort in Hokkaido.They have great hot spring as well!And food are wonderful,too!!
Also the quality of snow is fantastic!!It's like Canadian snow.
Even though you don't like ski or snowborad, It's of value to visit there.

KIRORO in Hokkaido
http://www.kiroro.co.jp/english/

NISEKO in Hokkaido
http://www.niseko.ne.jp/en/index.html

HAKUBA HAPPO-ONE in Nagano
http://www.hakuba-happo.or.jp/