Living in San Diego I have much of the same types of flora and Fauna that you do, and many of the same needs. Alot of the tools/skills are universal, but a little tweaking is required most of my knifes are in the 4-5 inch blade range, and while I own and love my GB Small Forest Axe, I only really use it when I go up in the mountains around Julian. Even there it can be a bit of an over kill, my gerber (p)axe, or a folding saw is usually more than enough. Other thoughts:
Shelter:
More worried about heat than cold, but I carry the heavy duty space blanket to use as a tarp/shelter as needed, coupled with a contractors bag. It is easy to throw toghehter a decent brush shelter around here. Lots of scrub, but harder to find longer sticks for a frame.
Water is my main concern and unsually carry two nalgene bottles and an empty 2 litter platapys in my pack. Doesn't take up too much space. I keep both portable aqua and Katydine (sp) tabs for purification, along with a steel cup for boiling.
Matches, BSA hotspark and a lighter for fire, LOTs of tinder around this kind of area if you know where to look, Pampas Grass, Foxtail, Cattail fluff. Huge fire danger both here and in West Texas, small and controlled is the way to go.
Food I try and know as much as I can about wild plants, becuase I cannot fish worth a damn, no matter how hard I try. I have taken several classes with Christopher Nygeres up in Los Angeles and they are worth thier weight in gold. Cody Lundin's books and training are also geared more towards our types on environments.
Just my .02 Hope it helps.
Mike