Not sure about this, Monument Valley is in northeast Arizona not Utah. To get to MV you would have to drive about 400 or so miles past Vegas, then turn around and go back, not the route I would choose. MV is also a Navajo holy site and entry is restricted by the tribe, though that is probably not a problem for R/B. And why drive by the Grand Canyon and not stop there? Notice, he ends up at the Monte Carlo Hotel in Vegas. Fun video.