We have spent the last 2 summers in Wyoming & Utah.....
Yellowstone is nice...I love Cody Wy...If you get a chance stay there a night & take the kids to the Cody night rodeo..Jackson Hole is nice...alot like Banff...pricey. We took the kids to Thermopolis Wy to the hotsprings & dinosaur museum. Salt Lake City is cool. Temple Square is really neat & The Hogle Zoo is beautiful!