Check out Denver's museums and indoor attractions ... Colorado Springs, which is about an hour south of the city. While in Colorado Springs for the day, visitors can hike or drive up Pikes Peak ...
In fact, you hardly have to drive outside of Denver ... place to visit. It's the perfect place for a scenic day trip or a pit stop at some of Colorado's most famous attractions.
As a Colorado local, I think the best things for first-timers to do in Denver include visiting City Park and going on a day trip to Colorado Springs.