These towns are packed with active young people, so they are great for solo travelers.
The coolest big city in the Rocky Mountains is most certainly Denver, Colorado. It’s a great sports and music town, and most residents live lives devoted to the outdoors. There is great food and craft beer in Denver, as well as in the neighboring hippie-college town of Boulder in the foothills of the Rockies. These towns are packed with active young people, so they are great for solo travelers.