rwbradley,
I didn't read everything in this thread but in my opinion, the Colorado River Valley would be fun for you all and really has its own "wow factor". Check out Topoc Gorge at the North end of Lake Havasu in Az. Take a jetboat ride tour up there- it takes a few hours and do it anytime from Nov. to May or in October. The area has things for anybody to enjoy. Personally, being from the S.F. Bay Area I'd avoid the big city areas entirely. The Sacramento-San Joaquin Delta is beautiful as well and lots of natural habitat to enjoy. Feel free to send me a p.m. and I can suggest some good camping spots. Enjoy your trip!