Would you consider reversing your trip, so that you can drive the PCH from SF to LA southbound? That would make it a more pleasant drive, putting the ocean and all the scenic view points on your side of the road. That way you will not have to cross over oncoming traffic each time you pull into and out of the scenic overlooks.

You could start with Yosemite (via I-80 and 395) to SF, the PCH to LA then on to the Grand Canyon via Sedona. to LV and back to SLC via Zion and Byce national parks. Allow at least a full day for each of GC, Zion and Yosemite - even that will not do them justice. Bryce can be enjoyed in half a day, unless you would like to do some of the hikes into the canyon.

Lifey