I want to take my son and his family (wife, 3yr old & 10 yr old)on a short trip (5 days) in July when he returns from Afghanistan. They live in Colorado Springs. I want to go somewhere no longer than a 4 hr drive. A place that is beautiful, has activities for the kids, something for adults. Hiking is out unless it is short and flat. I would appreciate any help or suggestions. I am assuming the ski resorts have stuff in the summer so I was thinking about that.