South Dakota is absolutely beautiful. The landscape is unbelievable and changes every 100 miles. You won't get bored going through this state especially with its abundance of wildlife.
If you like wide open spaces, Wyoming is the state for you. The mule deer seem to be everywhere.
Driving through the Bighorn National Forrest in Wyoming was beautiful with the snow covered mountains and pines. Yes, SNOW! We drove right up the mountain on Route 16. Our maximum speed was around 30 mph about what the temperature was, a chilling 28 degrees.
We stopped in Cody, Wyoming for another cold boon docking night. Brrrrr...