Don't worry, Lifey, I am old enough and boring enough to realise that myself and, whilst I do love the area, the most important thing for me is not ticking off huge numbers of stops along the way but making sure K has a great time. It is important to us that we keep it relatively laid-back so I've decided not to get too carried away with stops this time :) I think the route detailed in the original itinerary (together with the amendments in post 8) is pretty much perfect for us.
I figured it'd be great to go for the Million Dollar Highway if we're up for it when we're on the ground but, if not, leave things loose enough that we can take another day at Mesa Verde instead. I have tried to factor in a number of 'fire-breaks' along the way so that we can easily slow down if the need arises without affecting the overall plan.
I am so set on the route now that I have in fact started to book a couple of things this morning: Solvang hotel was the first (she is Danish; it seemed apt!) and I have just reserved for 4th and 5th July in Zion's Watchmans Campground and 10th July in Arches' Devils Garden Campground. Both are prime spots according to the photos on the booking website so very happy with that. Next up will be the DV hotel (still needing help on this - see above), Queen Mary (their booking system seems to be broken) and the camping in Grand Canyon and Yosemite (booking window opens on the 15th Feb)
Whilst the route is pretty much set now, I'd dearly love any input on the other questions posed through this thread to fine-tune the trip. Thanks in advance!