How you fly when no one is watching...
A recent accident has me reminding myself that in some cases, a pilot may become very carefree when flying in an environment where no one is watching. A prime example of this is low flying over water, particularly in seaplanes.
Indeed, I happened across an aircraft manufacture's web page which describes low flying techniques in their aircraft. This page is still there, after their chief test pilot died in a low flying accident in one of their aircraft.
Canada offers magnificent expanses over which one could fly at any altitude, and no one would know, nor care. As a very new pilot, I recall low flying a frozen lake in a friend's 182. I was miles from anyone, who would know? Well, who would know if I CFIT'd it either!? I recall suddenly realizing, that over the unbroken snow, I had no idea if I was 50 feet or 50 inches above the surface - I pulled up, and never did that again!
Civil land pilots are not trained to consider the additional factors associated with low flying: Loss of vertical reference, wires, birdstrike, where you're going if it quits, and even loss of horizontal reference if you're low flying among higher ground.
I doubt that anyone (other than maybe crop duster pilots) would want the liability of conducting low flying instruction. There are small elements of it in a seaplane rating (glassy water landings), but otherwise everyone who could be liable, is probably more happy if you're at 500 feet, other than departure and arrival.