Nice, I'm sure you'll have a great winter. (Although Niseko's opening was cancelled this weekend, but we should get a good amount of snow this week, so they should open next weekend.)
Nearby, Kiroro is worth a trip, even if it is a little flat.
If you can take a few days off, go and stay in Sapporo for a bit. Check out the city in the evenings and ski at Kokusai and/or Teine. Both are quite small ski areas, but have alot of incredible tree skiing.