Are you traveling secondary roads or interstates? How much time do you have?
Have you been to Yellowstone, Grand Teton Nat'l Parks? Nevada City outside of Ennis, MT (nicely restored old town), Bannack State Park - pioneers; take Hwy 93 out of Missoula, MT to get into Idaho.
We don't mind traveling off-route to see interesting things....how about Stanley, Idaho and the Sawtooth Mtns.; Massacre Rocks State Park, Idaho; Park City, Utah (Olympic park); Salt Lake City touring
Full-Timed for 16 Years
.... Back in S&B Again
Traveled 8 yr in a 40' 2004 Newmar Dutch Star Motorhome
& 8 yr in a 33' Travel Supreme 5th Wheel