Two weeks in Colorado and you can not venture too far from the front range...?....ouch! In my opinion, Colorado pretty much starts West of I-25, the rest is just glorified far Western Kansas, LOL!

If I were you, I would try to get out to the Sand Dunes near Alamosa in November since there should be snow ( god willing ) on the surrounding peaks and maybe even some of the dunes depending on the weather. Not sure how Pikes and Garden of the Gods looks right now after that massive fire, but with some fresh snow on it the contrast could be interesting. Even though Fall colors were stunning this year, it has been tough in terms of the drought, so don't expect a lot of color at all at this point, the ground moisture content is non-exsistant.

All that being said, I am sure you will find things to do...