An outdoorsman's paradise, surrounded by vast natural beauty and a smog-free climate, Boulder is a city that brims with the energy of the healthy and happy. Of course, this dynamic is not surprising as it is a city of 100,000 permanent residents and nearly 30,000 students who attend the flagship University of Colorado at Boulder. Lush green land surrounding town serves up over 100 miles of trails, and part of the Rocky Mountain range begins on the west side of town.