Nice!
Last year, actually it was Sep 2010... I did 'Frisco to Vegas via San Diego. Stayed in Carmel near Pebble Beach and then Santa Barbara on the way and also had a few days in Palm Springs.
Did Highway 1. Brilliant road.
Visited Grand Canyon, was going to do choppers but they weren't flying that day due to wind. Did the sky walk which was quite cool but very expensive - the native americans are making a killing at the canyon.
Agree that Freemont Street is a must. So is a show. We did one of the Cirque shows and it was ace, the half price ticket places was recommended by our hotel Concierge, we ended up getting a few things from them and it was a total bargain.
I've never been bored in the states!