I've been going there the last year, it's a cool place. From May-Nov there are top speed records, you can watch cars going 200+ mph.The is an off roading area north of Los Angles called El Mirage. I have not been there yet but it is not too far away.
http://elmirage.org/
More off road maps for sale here
https://www.jawbone.org/ohvmap/
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