Family of 5 (3 children 5 & under) plus grandparents headed on 10 day road trip from Boulder to Vandenberg CA June 10-20th in 5th wheel trailer. Will have spent 4 days at Glenwood Spgs prior to 10 day journey. Military family returning state side from Seoul, Korea would like to see the Black Canyon, Bryce Canyon NP and Arches NP. Which of those would you recommend seeing if time doesn't alllow for all? Or would Grand Canyon fit better in there somewhere and omit one or two of the others? I just can't get a visual on the best itinerary for us as the planning grandma. We're all active and looking forward to journeying together. Thank you for any suggestions!