LA Parks and Rec is for all Los Angele CITY parks and beaches. Not all parks, just Los Angeles city parks. But unfortunately, LA county has their own restrictions. And then the state has theirs. There are other cities in LA so the LA City ordnance does not apply to them. Long Beach for example does not have this city park ban because it's a true city with it's own mayor, and city government. Unfortunately, it's also in restricted airspace because it has it's own airport so LAANCE is required. Not sure which cities have a park ban, you just have to search for them one by one.
The LA city ban is an old law that does not use the term "Drone" but it's been used by LA Police to prosecute reckless drone flyer who hit a helicopter a few years back. The Drone is still and "aircraft" so the law applied.
Municipal Ordnance LAMC 63.44 section (b) (8)
"No person shall land, release, take off or fly any balloon, except children toy balloons not inflated with any flammable material, helicopter, para kite, hang glider, aircraft or powered models thereof, except in areas specifically set aside therefore. No person shall engage in any voluntary parachute jump LAMC 63.44"
Park Information: Municipal And Penal Codes