Additional consideration in avoiding rotorwash- wind. Obvious to a helo guy, but I've had ittie bittie airplanes taxi down wind of me, park and complain of being blown around.
If a helo's sitting there with rotors turning, avoid the down wind side. It'll shut down or depart shortly. Even a 4 pax type helo and good stiff breeze can put out a tremendous air movement- sufficient to push an identical helo sideways on the skids several feet, until it weathervaned. We were working close (60 feet), but that kind of energy doesn't go away in 3 rotor diameters.