If you go to Monument Valley, you really need to book a tour. Don't drive through yourself! I originally thought that my family I would drive Monument Valley ourselves.
Boy was I wrong and I was glad that my wife booked a tour because you're only be able to access a small fraction of the valley in the parts you're allowed to go to on your own. Plus, when my family and I went, we rented an SUV that definitely could not handle off-road parts of the valley. At any rate, I highly recommend Native Spirit Tours. Our guide, Don, was incredibly knowledgeable and patient with our kids. He took us to caves, petroglyphs, areas with cliff dwellings, and lots of vistas. We had an amazing time!