How about Winter Park, CO in the off-season? This first place has a variety of accommodations plus flexible meeting space and on-site food and bar service, and their off-season room rates aren't too high, especially for group rates.http://www.winter-park-colorado-lodging.com/hotels/wpmtnlodge.htm
This 2nd place is nearby and is more of a condo resort. They have studio, 1 BR, 2 BR, and 3 BR units with full kitchens. They also have on-site food and bar service plus flexible meeting space. Their off-season rates are a little higher than the first place.http://www.winter-park-colorado-lodging.com/hotels/ironhorse.htm
Both of these places are at the base of Winter Park ski area, which is within a 2-hour drive of Denver Int'l. Airport. DIA has several low-cost carriers plus is a United and Frontier hub, and a Southwest mini-hub. DIA also has non-stop service to London on British Airways and there are shuttle buses that run the route from DIA to Winter Park too. One can also arrive by Amtrak with a station nearby in Fraser, CO. Winter Park runs a scenic chairlift and allows mountain biking and hiking on their mountain, and there are other hiking and 4WD opportunities nearby. There are also numerous restaurants nearby, plus high-end golf opportunities and several large lakes nearby including Grand Lake and the western entrance to Rocky Mtn. National Park too. There is also a Quality Inn in Fraser that has conference space and would be even less in the off-season too.
This might be a little on the pricey side, but there are a wealth of character-building recreational opportunities nearby. There are plenty of other more remote or isolated/safer places available in Colorado too.
This place is between Denver and Colorado Springs and sort of reminds me of a western version of Kirkridge. In the Spring and Fall they offer the ability to rent the entire facility for groups. They do have on-site food service. It is a family-owned working dude ranch in the mountains.http://www.lostvalleyranch.com/corporatemeetings.html