We love Park City. Stein Erickson Lodge is wonderful and you can ski right out the back door. They'll take you down the hill to Park City proper in their van and pick you up whenever you want.

Sun Valley is also lovely. There are 3 main ski areas, all accessible by bus. I don't think the bus ride to any of them are over 20 minutes long. There's a wonderful lodge on top of Seattle Ridge where you can have a meal and something warm to drink. In the evening, they have a horse drawn sleigh to take you to a cabin in the woods. There you can have another lovely meal and libations. You can either go back by sleigh or in the hotel van. You get lots of blankets to cover up with in the sleigh, but it's still cold. The nice thing is the quiet ride in the moonlight.