We are a family of five from Australia and will be holidaying in the USA in January 2015. This is our second trip at this time of the year and drove on snowy roads and through a snow storm on our way to Colorado last time. This time we are travelling from Las Vegas via SLC on our way to Driggs for skiing. I am wondering what is the best route between these two cities to take advantage of the beautiful National Parks and Bryce Canyon - including route 12. I have two in mind - the first via Zion and up to Bryce NP and then Route 12 or go to Cedar City and then through Dixie National Forest and then on to Bryce NP. Also could this part of the drive be done in one day - we are on a schedule but would take advantage of view points and short walks on the trip.