I am trying to fill in the last few days of travel and need some suggestions about things to see and do as we work our way from South Dakota to Salt Lake City in October. We will begin in SLC, then Idaho, Yellowstone, some Montana, across highway 90 into South Dakota. From there, we will probably take 18 west and then get to I-80. We want to visit the area around Rock Springs, WY, before heading south on highway 191 into Vernal, Utah. I need some help with the time between leaving South Dakota and arriving in Rock Springs. Any 'must sees', and food and hotel favorites? Weather concerns for driving? Thanks.