Having grown up in CA with weekly jaunts to the Sierras with Dad for fishing, I thought Rocky Mountain N.P. wasn't worth the trip. It reminded me of Reagan's
"If you've seen one redwood...." There are, of course, no redwoods in the Rockies, but the Rockies seemed rather prosaic for someone with ready access to the Sierras. On the other hand, if you have only known the plains, it will be awesome.