If snow conditions permit it; some US major resorts will be full functioning the US-Thanksgiving weekend (and before), and the rates then (lift-tickets and lodging) are still off-season-low.

Have been there then and done this so far in the last 10 years at:
* Jackson Hole (the steepest skiing so far exrienced in North America)
* Lake Tahoe Area (Squaw Valley, Heavenly, Kirkwood)
* Taos, New Mexico (I did never beliefe before, that there would be such great skiing in New Mexico)
* all major Colorado Resorts including Winter Park, Keystone (night-skiing till 8PM!), Breckenridge, Vail-Beaver Creek, Aspen (all for mountains including Snowmass, Aspen mountain is not for Snowboarders)
* Salt Lake City/Utah's resorts (often the ski world cup races start there in late Nov already)
* Banff-Lake Louise (women's ski world cup starts there in late novemebr)
* Whistler/Blackcomb