One of the most unmissable things to do in Colorado is to hit up the Rocky Mountains for a spot of hiking. It’s a no-brainer. An hour and a half drive outside of Denver, join one of the many, many trails. We’d recommend Twin Sisters Peak (which is even more reachable if you’re staying in Boulder). It’s quite challenging though and will take pretty much all day.
Football fans won't want to pass up the chance to spend some time on the Denver Broncos' home turf. The stadium can hold more than 76,000 NFL junkies across different levels and it boasts something you don't normally associate with football games: several public art displays. Surprisingly, the stadium was built in 1948 as a minor league baseball stadium, but it became home to Denver's football team shortly after, nurturing "Broncomania" since the team was formed in 1960.
Why not start your trip to Colorado by understanding the history of its capital, Denver? This city is pretty famous for its Old West feel and is full of old architecture and known for tales of gunfighters, crime families and conmen. Go and admire the frontier town atmosphere, take in views of Union Station and other landmark buildings, see what’s going on.