It really depends on the badge of the day who runs into you and what rules or ordinances they pull out of their hat, or even make-up. CA really is a mess from city to city and park to park to make a solid call on. CA seems to be unlike Arizona where they post signage in some parks as to whether you can fly a drone there or not and where. Many CA state parks are a judgment call by the superintendent of that park on allowing drones to fly there or not. Some can get snobby about having some sUAV million dollar liability insurance too to even fly there.
Some state park info is here on commercial and some super's are more aware of it now and applying it generally to all, and I see even CalTrans is getting into the mix too:
http://film.ca.gov/wp-content/uploads/UAS-Use-Requirements.pdf
Fwiw, I've written to my local CA councilman regarding flying for fun or training and got zero info back, but least I asked and they have it on file should I need it later for defense. So it gets back to who complains about what and what badge interaction you get into. It's tantamount to shooting guerilla style on the streets of LA now sans a permit and because you have some expensive DSLR and the badge will call your shoot "commercial" (His judgement call on ticketing and leaves it for the judge to figure out.) and not having a permit gets you a citation.
CA is so over-ridden with film commissioners for every county and town as well that it's a burden no thanks to Hollywood. If you ask one, you'll be shocked at the hoops and expense to do some aerial work legally, and by the day or hour too. But at least no one can hassle you if you have all the paperwork in order. The other problem is that they are on the high end public payroll so their fees may seem reasonable to them, but try and sell their high fee to someone you are shooting for and they'll think you are ripping them off.
Drones are pretty much like owning a gun in CA. If someone in your apartment sees you taking a legally owned rifle or hand-gun to your car in the carport and calls it in as "suspicious," your day won't go well. Same for drones and "tresspassing" or "privacy invasion" call-ins.
Good luck - and it often really is in CA.