We did 2 road trips -
1) PHX - Monument Valley - Page - Antelope Canyon - Grand Canyon - Sedona - Back out of PHX
This was flying out on a Friday and flying home on Sunday. LOTS of driving but we made many stops. MV, Antelope Canyon and Sedona were the highlights of the trip. Grand Canyon was at the bottom. It wasn't bad, just in comparison. We stayed a night on the rim and eat dinner at the lodge. Really fell in love with Sedona. I purposely had that as the last stop before heading home in order to get some rest. We made another trip to stay there when DD went on a college visit to UAriz.
2) Vegas (1 week timeshare) - Zion/Bryce (1 night hotel) - Red Canyon - Death Valley -
Disneyland (3 nights) - up the PCH all the up to Seattle passing by the redwood forests, Oregon sand dunes, Columbia gorges, Mount Rainer, etc. Met the grandparents in Seattle for a 1 week cruise to Alaska. The entire trip was about 3-4 weeks including the cruise. I forget the miles without looking at my notes.
Honestly, I wouldn't cut Antelope Canyon or Sedona UNLESS you are sure you will be back in the area in the future. The Grand Canyon is one and done for me (unless we want to visit the north rim one day). Monument Valley was worth the drive to see. We did stay one night at the reservation hotel that faced the mittens and did a guided tour with the Native American guide in the back county (reservation).
Vegas and DL maybe on another trip?
Have fun planning!