Heliport - I was just about to say something about the San Onofre restricted area when Whirlybird mentioned it !
It's because ( partially ) of the nuclear power station at San Onofre, but the restriction stops at about ( from memory, Whirly has my charts ) 200' MSL, so as long as the cloud base is OK there's not a problem. Or - and this wouldn't be my option without a lifejacket and contact with some sort of controller - you can avoide it at any height by detouring over the sea about a mile offshore.