I think running a PWC at night is a bad idea. Unfortunately PWC's, since they are relatively easy to operate and maneuver, attract a lot of inexperienced people (like myself). I've personally seen guys just jump on their buddy's ski and go full throttle without regard to safety, other boaters, the laws of man and physics, etc.
Boats, in my limited experience, tend to be operated by more experienced persons and less likely to be solo operators. In New York the law requires you to take a safety course before operating a PWC, but not for a boat. Perhaps for this reason.