Hokkaido: where else to go?

visited Hokkaido last year by tour package : seen
Sapporo: Otaru Music Box museum
Odori Park White choc Factory
Sounkyo: Asahikawa Zoo, Sounkyo Gorge, Shiraoi Ainu Village
Nonoribetsu: Jogokudani Hell Valley
Japan Beeer Factory
Nijo Seafood market
Tanuki Shopping Arcade

We love Hokkaido and plan to go FnE next Jan or Feb

Where else can we go?

If not Hokkaido, where else is cold and snowy during that period?

Sapporo Snow Festival:
http://www.japan-guide.com/e/e5311.html

Drift Ice:
http://www.japan-guide.com/e/e6868.html

Cranes in Kushiro:
http://www.japan-guide.com/e/e6792.html

Winter Sports in Niseko, Furano, etc:
http://www.japan-guide.com/e/e2262.html

More:
http://www.japan-guide.com/list/e1101.html