A beautiful drive up the road from Boulder, CO of about an hour brings you to a beautiful National Park - worth the trip if you can make it! Head to Estes Park and go from there.
Gear Rental for snow shoes, etc. can be found at Estes Park Mountain Shop
West Creek Falls - a rigorous hike
During the summer there is a way to cross over a major section of mountain range - highly recommended
In the winter - it is equally breathtaking to drive the roads, however, the roads over the mountain are closed