I like your itinerary we have enjoyed all of those stops. You are very fortunate with having 8 weeks to do it. Like others have mentioned (and I agree) Estes is great but we don't go any more as it is just too crowded. Many of your destinations can be as short a stay (depending on your families activity level) as you choose. Many of these destinations are not much more than "windshield" tours for those that aren't active and into hiking. I suspect your crew could get the most out of every one of them. Lastly, I would plan to stop at the Great Sand Dunes heck you are practically going to go right by it on 160. Have fun!