Canadian Rockies. Have gone back any number of times over the past 40+ years. We're "hard core" hikers and there are endless trails in the contiguous national parks Banff, Yoho, Jasper, and surrounding areas.
"...Why is everyone a victim? Take personal responsibility for your life..."
Estes Park and Durango, Colorado. Estes Park because it was our first trip to Colorado and loved the scenery and hiking. Durango because at the time (not anymore) it was dog-friendly as well as beautiful. Afterwards, Colorado Legislature passed some restrictive laws about dogs in public places, decreasing the number of places we could travel to with our beloved furry family member.