First off, Monument Valley is so scenic! And seeing it was even better with Larry as our Navajo guide. He was knowledgeable, friendly and humorous. We did the early 8 AM tour in an open tour truck with Larry driving. We could hear him very well with the speaker in front of us.
We had the opportunity to go to restricted areas to see arches, hieroglyphs, and visit a local family. Great morning.
Couple of suggestions...
Go early since the roads are rocky, uneven and much dust is kicked up by vehicles. We avoided some of the dust by being one of the first vehicles in the Valley. Also take sunglasses and a kerchief or something else to cover one's mouth & nose due to the dust. Might also have water to drink while in the truck and eye drops to use after the end of the tour.
We were also happy to tip Larry and the family we visited. Lastly, a thank you to the Navajo people for sharing their time and land with us!