Crazy Horse Resort has Jeep rentals for the adventuresome, along with a mini golf course... All
of the above links for Colorado are for establishments in Chaffee County,
Co. There is also Fun Time Jeep Tours in the Arkansas River Valley(they are
a call for reservation place... 1-888-539-2962).
If you are really into Whitewater Rafting, check out Arkansas
Valley Adventures. I received a catalog from Bill
Dvoraks Kayak and Rafting Expeditions with everything from family trips
to adventure trips, though I'm not sure about going to someplace called Desolation
Canyon.
There are more counties out there, but Chaffee County is very aggressive in their marketing. If you want more information about Colorado, try The Denver Post.
For all of the Colorado links I have listed, I went through one site, and I will be buggered if I can remember which one, but it might have been Fourteenernet. If you sign up for information from a tourist site, you will get LOTS of information.