For some ideas of where to go in western and central Colorado for some day-long smile type Jeeping go to:
On the Happy Trails
If you are into class 6 and 7 or 7+ trails, there are some excellent opportunities there you can read about.
Some you may have heard of, but there are some gems that VERY few even know exist.
The Calamity Mesa Loop for instance is a class 7 or 7+ with 20 miles of great obstacles that had been closed by Mother Nature for over 8-years.
Pace Lake is another that had been closed for years and is full of obstacles and views to die for. You won't find them in any books that we know of, but they are more than worth the trip.