Kill said it. Walk-to and Great nightlife are hard to couple. SLT is a blast, but Heavenly is just ok. Park City is also a blast, but the resort is just ok. Vail offers a slight blend of both, but Vail nightlife isn't crazy. I'd go with SLT. Heavenly is fun and you can catch a decent shuttle to Kirkwood for like 15 or 20 bucks.
Traveling the States and Taking Pictures