Replying to Hitting the midwest this january

So I go home for winterbreak in about a week, San Francisco to Rochester, NY (yay Bristol!), while pumped to ski the home mountain and VT hopefully, I don't often get to spend the ski season skiing as much as I would like. Additionaly the biggest mountains I've ever had the opportunity to ski have been Tremblant and Killington. My parent's decided to be really kick ass and fly me out to Boulder for a couple days to stay/ ski with a friend of mine who goes to CO, Boulder on my way back to SF for next semester. I know Breck and Keystone are a must, but I was wondering what other resorts or whatever are worth checking out.