Telluride - Ouray, Silverton, Durango and possibly Mesa Verde
This area would be our choice. It seems your wife and kids need entertainment and are bored with driving through parks.
In these areas you could rent a Jeep and do some awesome trails of all abilities in the Silverton area. This is a well-preserved mining town of old days in a gorgeous mountain area. Stay in Durango and take the train up to Silverton is another suggestion. Elect to take the bus back - too much train is tiresome for some - it is slow. There used to be glider rides out of Durango. The local gym has an awesome pool. Nice stores for shopping for trinkets, too. Good restaurants.
Mesa Verde - take a ranger-led tour of the ruins where the family can climb ladders and there one tour that you crawl a short distance through a tunnel. Kids love it!