California has a blanket rule: No flying r/c of any kind.... that being said there are many state parks that have allowed r/c flyers for years, one close by me (Folsom Lake) on one of the parking lots that goes un-used during "low season"... I think it really depends on that particular Parks management and the popularity of the park. Until recently I was not allowed to do aerial video of my own events when I rented a state park. There are now new rules that will allow aerial filming "drones" with the consent of the park administration - and a permit. So in a sense, things in CA State parks is looking up a bit...