Boulder Colorado is located about 35 miles northwest of Denver at the foothills of the Rocky Mountains. Recreation in Boulder is one of the most popular things the city has to offer. You will find plenty of trails, recreation facilities & outdoor recreation activities in Boulder. The city is also known for diverse restaurants and retail shopping. Although many people don't think the nightlife in Boulder competes with what Denver has, you will still find plenty of bars & night clubs for late night entertainment. Boulder is home to the University of Colorado's main campus which is responsible for younger popluation to the region.