At the point of being irritating, I usually ask strangers if this is their first flight from Honolulu to the Big Island? If so, I suggest the left side of the plane on the way into Kona, because you get to see the other islands, which will be to the north of you as you go.
I also suggest that they get in line early and upon entering the plane, ask the stewardess if she will be opening the rear stairway at kona? If so, I suggest that people sit in the back of the plane and exit from the rear stairway. It is quite faster that way than waiting for that stairway to be rolled to the front of the plane.
As a side note, when they land in Kona, it MAY look like rain... it probably won't :-)