I really like Busskipper but this image is way too much Photoshop!
Forget the North Rim. You see but about 10% of the Grand Canyon...go to South Rim. Yup, more crowds and so much more to do and see. Do NOT skip Grand Canyon.
Spend more time at Bryce and less at Zion. More beautiful hiking there. Do not miss hiking Queens Garden.
I could go on and on about CO - we love it. We spent 8 weeks there this summer into mid Sept. Ouray and Red Mountain Pass will blow you away. We already have reservations in many places for next year.
Speaking of reservations.....many of the places you are going are in very high demand and I strongly suggest you firm you plans up and make some reservations. If plans change, cancellation fees are nothing compared to driving around trying to find a place to stay. Spend your time seeing what you went there for and not looking for a place to stay.
We have part time RV'd 19 years and been to over 190 rv parks here in the western states; feel free to email or PM me if you would like.
Get to Capitol Reef if you can; one of our favorites.
We lived in Estes 8 years and would not go back again; have not in years. Love RMNP but the zoo in Estes itself is not worth it. And pine beetle has destroyed many of the beautiful trees. Forget going to the west side - very limited in Park things and anything else. Less crowds, yes; there is a reason.
Enjoy!
Lauren