Paul, Steve & Tim:
Thank you for your very interesting advice. I like the idea of The Alabama Hills, Joshua Tree National Park, and also Anza Borrego State Park. That said, it seems to make sense to focus on LA as the jumping off point; rather than San Diego. Luckily, I can decide on a whim where I land, and judging by the driving distances involved the northern city makes more sense. What isn't so easy is allocating my time thereafter. But you have all provided significant help. I will now research further; focusing on the above three venues.
I am reminded by all of this of a (true) experience I had in Seattle years ago. A taxi driver asked myself and Swedish companion how we liked driving on the right hand side of the road. After digesting the news that Swedes drove on the right and only the English drove on the left, he turned and asked: "OK, so what happens at the border?"
I feel I know as little about Southern California and the 'old American west' although none of you have been so unkind as to infer any such thing.
Ah, well. Thanks again.
Cordially, Dick Kenny