Might want to post for travel ideas on: “On the Road_Travel Chat”
I get through Utah at least every other year and it’s fantastic so much unique geologic features. We did a 20 day spring time trip doing the “Utah Loop” seeing 4(missed one;Canyon Lads) national parks and 2 state parks. Our highlights were Bryce Canyon, Arches, and slot canyons in Escalante all fantastic. Several times we have spent a couple days at Flaming Gorge, very beautiful and great fishing.
I live in Cal. and if I had to pick, I love the Big Sir area, all of our redwood(sequoia) forest are spectacular and if your trip is later in the spring our deserts(not on coast) are great. There is a National Redwood park that is stunning, at the northern edge of Cal. on the coast.
I didn’t mention Yosemite because it’s not usually open tell late spring but everyone should spend at least a week of their life there(not on the coast).
Too much to see and enjoy