Guanella Pass is a great drive in the summer, and there is a variety of terrain up there to ski in the winter and spring. The road was closed in august of 2009 due to rock fall danger, so it is a longer skin to some places, but the old resort, Geneva Basin is a fun spot for a backcountry ski trip. Argentine Pass is another spot to go for some longer tours, you just want to make sure the snow is decent up there!
How to Get There
take I-70 West to Georgetown, go through the town, and up Guanella Pass Road. From here you can get to Geneva Basin, Argentine Pass, and a couple of other spots.
Like most of colorado in the winter, you can camp there, but be prepared to be a little chilly.