Catalina Island looks right at San Pedro and the LA Harbor, a site for oil refineries and tankers. Explosions, or whatever stunts they would pull here could be very dangerous..
Actual distance is about 26 miles, Catalina is visible from several elevations throughout the LA area.
Santa Catalina sounds like a red herring. A freighter there would stand out among the yachts like an goony bird among sparrows.
I'm going to take the guy's word at face value and suggest someplace like Portland, Oregon. No oil refineries but lots of natural gas storage tanks in northwest Portland, right on the banks of the Williamette River. Ought to make one hell of a fireball.
And then there's the Trojan Nuclear Plant on the Columbia River. It is closed down and all the spent fuel has been removed but hey, how would they know that!