Other than to say you have mapped out a very exciting and demanding trip, there is only one suggestion for a POI. The POI is Antelope Canyon outside of Page AZ. The Canyon is quite long and there are two main spots to see each about 3/4 of a mile walk, the Upper Slot and the Lower Slot. We have visited both, the lower part just last week with the DGS, I would say that the lower slot is more interesting and has better photo ops.
As you leave Page on the road East toward Monument Valley, just before the very clean coal fired power plant, the off ramp will take you to both parts of the canyon. At the end of the off ramp, turn LEFT over the highway to the lower slot. Ahead on the left you will see two outfits to book with. All visitors are guided by Navajo Guides. The first outfit is the one we used last week, they do take reservations but walkups are welcome and we only had a 20 minute wait as walkups. I DO recommend this outfit.
We have seen the Upper Slot and it is fantastic(lower is better)but it is more expensive and has groups of up to 75 tourists at one time and is reservations only. The first outfit on the left side limits groups to 12 or 14 and as I said walkups are welcomed. I think we paid $28 per person.
I will try and post a picture in a follow up post but I have to read the instructions again.