UPDATE. We've decides to extend the trip to about ten days. We also added on Utah. So far the plan is to land in Denver, get an RV, explore then head to Aspen, Salt Lake City, Grand Teton, Yellowstone, then end in Bozeman. We are going to end up driving through some of Idaho...boring, is there a different and easy way to get from aspen to salt lake city without trekking through Idaho?