Hey Jim, You are going to love Utah's National Parks! I would recommend spending more time in Arches than any of the others. Bryce is nice, but you can get some pretty epic views from the drive-to scenic stops along the way there. The hike up to Delicate Arch is relatively easy and pretty short, though there are some steep parts. We can usually get there in 30 minutes. Capital Reef and Canyonlands are great for day hikes. Capital Reef doesn't get much play because it's dwarfed by the staggering of Arches, but you should definitely go to both of those places if you have time.