Rv in Utah Arizona national parks in JUly

[paris]

Hello,
After much dithering -and help from this forum - we have finally settled on a two week trip to the national parks in late July early August with our two kids aged 13 and 9.
We start in Las Vegas and move on to snow canyon (one night), Zion (three nights),Bryce (three nights) and Grand Canyon North Rim (Three nights). But we have three nights between Bryce and Grand Canyon and I cannot decide whether we should spend three nights at Lake Powell or if we should do something else for part of that period. I think the kids would love Monument Valley but am not sure if it is out of the way given the next stage to the Grand Canyon North Rim. Would it be worth one day at Monument and would this mean a very long day in the rv afterwards to lake powell. Or can one take day trips to Monument from Lake powell? Also, I would welcome any recommendations for RV camping at Lake Powell - I am a bit put off by what seems to be the leisure resort aspect which i suspect means very crowded and noisy. We like to have hookups but dont need brights lights and bars. Finally for the trip from the North Rim back to Las Vegas we will have one night and any recommendations for a good place to finish off the trip would be welcome.
and if anyone looking at this itinerary has suggestions for backroads we should take, for places to stop off for a quick visit/lunch, or for activities that the kids will love (they will love the parks and ranger programmes i am sure) I would be most grateful.Also suggestions for the kids in Las Vegas where we will spend a whole day and night at the beginning of the trip while we wait to collect the rv.
Thanks in advance