Yeah, so EBRPD has an old rule from the RC airplane era that bans operation of aircraft in the parks. Around 2014 they issued a press release saying it applies to drones. What's not clear to me is what operation of drones in the parks means exactly, and if all the YouTube videos I see of people flying in while standing across the street mean they're being clever legally speaking or if they're just not getting caught.

i.e. to what extent does the park district control its airspace or do they not have jurisdiction.
If you do some searching some cities (Dublin) and other entities (HARD) have similar rules. Some (San Leandro, Oakland, San Francisco) don't, although in the city you have to be careful because the feds still own a lot of the park areas. But Golden Gate Park is a city park and seems to be legal...