Originally Posted by Reindeerflame

A bit ambitious! Death Valley, for example, is a huge area, and the driving time from Las Vegas is at least 2 hours, 30 minutes each way.

There's nothing to see in Las Vegas, especially if you've already been there; perhaps cut to one day?

Overall: lots and lots of driving, and relatively little time to see anything in depth at the destinations. As soon as you take a hike, at say Bryce Canyon, a half a day or more is occupied, and reduces the time available for driving to Zion.

Also, you omitted Cedar Breaks National Monument between Bryce and Zion, a less-visited park with pretty views.