I'm assuming you won't have a rental car. In that case, Google "Park City Car Rentals" find a convenient agency, and rent a car for 24hrs on the evening before. Specify a ski rack (all the agencies have them available) and you will be good to go. This gives you the most flexibility in terms of where you wish to ski, park, and you can carry a lot of gear that may or may not need during the day. If you are not there during "President's" Week, you will be able to park in the first or second row in any lot at Alta or Snowbird.