I think I just answered your other question (I told you abt the Volcano). I'm going to CO this summer, driving through Des Moines, NM then headed over to Buena Vista/Leadville , CO. White water rafting, hiking, (I'm definitley renting a Jeep to go to the Ghost Towns). You can rent a cabin or camp.
I found this great company, Arkansas River Adventures, and they have really helped me with pricing/specials and all the info I have needed. I've never been to Colorado before so I needed a lot of help. :P
I've been to NM and its just not my thing. To each their own, but I'm rooting for CO this summer!
I also bought new hiking boots this summer, so I have been dying to break them in.
Good luck deciding!