Livermore - Ahart aviation
Concord - Sterling
Both have Cherokees for rent.
Don't sweat the airspace too much - there are vfr corridors and the approach controllers will see you right!
And most importantly, you MUST go to the following;
Castle AFB museum near Merced.
Half Moon Bay for fish and chips at Barbaras.
Columbia airport - old wild west town
Have a damn good time!!!!