I have discovered that it is just as cheap to rent a car from Denver Airport as it is to take the shuttle.......I'm not sure what to do, I worry about driving around in the snow, though I've driven across I70 before in the snow. Should we just stick with the shuttle to Vail and be carless for a week? I'm leaning towards getting a car, I'd really like to spend a couple of days at the hot springs. Thanks for any advice! We are staying at the Vail Mountain Lodge and Spa.