Donna and glc, Thanks guys - I hadn't even thought of the rush hour problem or parking. Need to plan driving into these cities quite carefully, if indeed we drive into them at all, and the bit about staying on the 'further' side is great advise.
Dave, you are absolutely right, that stretch from Denver to Flagstaff has anything and everything in it, so we'll need to think about the best way to get the most out of it. And going Death Valley - Yosemite - SF would make sense, time allowing, plus that way we would drive down the PC Highway on the 'right' side. LA is not a high priority, but it is a 'famous' place, I guess, and a convenient place to fly out from.
Thank you.
Subman