Colorado has some of America’s best skiing as well as some fantastically fun big cities, like Colorado Springs, America’s Olympic City. And while the ski towns and major metros are certainly fun to visit, it’s well worth exploring some of Colorado’s lesser-known destinations, like Castle Rock – about 30 miles south of Denver and 40 miles north of Colorado Springs along the I-25 corridor. It’s especially great if you enjoy outdoor adventures. Hiking, biking, zip lining – there are all kinds of ways to have fun here.