As I have mentioned before, one of the greatest things about life out west is the accessibility to the outdoors. Boulder's backyard is home to the Rockies and only naturally Rocky Mountain National Park. A few weekends ago, I was fortunate enough to spend some time up Trail Ridge Road where, nature is only visible to those who are up for an adventurous drive.
Trails off the road exist where one can see what life above tree line is like. However, make sure you know where the "non-touristy" spots are in order to get some good wild life viewing...
Yet another reason to love life out west.