[triplets]

Hi all,
I posted a while back about our big road trip this August, we are in England. We have 9yr old triplets so looking to keep everyone happy! So far this is our trip
2 nights in San Fran
4 nights in Modesto(pen-pal)
5 nights in Yosemite
2 nights???
2 nights Williams Arizona(take train to canyon)
6 nights in Sedona
2 nights in Palm Desert
4 nights in Anaheim

So my problem is the bit between Yosemite and Williams, we have 2 nights to find.
Husband wants to go Death Valley/Vegas
I am just woorried about the intense heat in D Valley
All accomodation in D Valley already fuly booked, Furnave Creek etc.
We have booked everything else and really pleased with what we have booked. Please do you have any ideas, alternate routes, something to interest the kids, nice resort with good pools etc? Thanks!