Wrestler Ray "Thunder" Stern kept an aerobatic airplane at San Carlos airport. He used to practice his aero routines over the Crystal Springs reservoirs. From interactions at the airport we knew that he wasn't a nice man.
All that airspace is Positive Control now even for VFR traffic. Probably have to go out to Tracy or south of Gilroy to have a practice area.
I have a buddy that practices over Gilroy and Hollister.