Seeing Monument Valley was awe inspiring! Glad we didn't do the self-guided tour in my son's car, that road looked horrible for non high-clearance vehicles. Not having to drive and being able to go into the back country made the tour worth it!
We booked the tour the day before, not sure how Navajo Nation would be on the day of the Annular Eclipse. The Park opened at 1pm and our tour was for 2pm, but we started late since the tour party was waiting on more people to get in through the entrance. Unfortunately, I feel we didn't get the full tour, or at least less time at each site. The guide, though very nice and personable, didn't seem as knowledgeable as those I read about on the reviews. I would still recommend the tour though.