There is a "triangle" in Western Canada...from Jasper, just west of Edmonton, South to Banff, and West to Kamloops, that contains some of the nicest scenery in North America. The mountains aren't as high as the Colorado Rockies, but they are a newer mountain range with massive sheer rock walls, etc. The area around Jasper is teeming with elk and mountain sheep, and it is not unusual to have to stop the car for several minutes while the wildlife ambles slowly across the road. I have video of a huge bull elk "bugling" in my face just a few feet away, while I was holding the camera very still, and hoping he would not charge me. There was also the time when I stopped for a herd of sheep, and crawled in the back of the pickup to get something, and a bighorn ram decided he liked my shoe and pulled it off..he finally dropped it a few feet away.
The Columbia Ice Fields, halfway between Jasper and Banff, display graphic evidence of the warming climate. Years ago, the highway was built just a few feet away from the base of the glacier, and now the ice has receded way up the canyon. The tour buses that take visitors up on the glacier are a ride well worth the price.
If a person likes unspoiled mountain scenery, the Canadian Rockies are the place to go, and then coming back, go through Calgary, and drive the Highway to the Sun in Montana. That whole area is Paradise.