There is a lot to see throughout that area. As stated by others, I would not include Death Valley. Even without Death Valley you still have a lot of driving to do. I would consider adding Natural Bridges, there is a wonderful hike under all 3 bridges. Depending upon what day you leave there you could head back east and take the ferry from Hall's Crossing to Bullfrog (in October and November the ferry only operates Friday, Saturday, and Sunday 4x/day). More ferry info here:
https://www.udot.utah.gov/main/f?p=1...0:::1:T,V:2257,
You can then head over to Capitol Reef and then down through Escalante to Bryce. There are any number of interesting things to see and do through that area.
A good book with some ideas:
https://www.amazon.com/Hiking-Southw.../dp/0898869498