What is an inappropriate place to park an aircraft without engaging the tail wheel?

Parking an aircraft on the runway without engaging the tail wheel is inappropriate primarily because runways are designated for takeoffs and landings, not for stationary grounding of aircraft. The presence of an aircraft parked on the runway can obstruct operations, create safety hazards for other air traffic, and violate air traffic regulations.

In contrast, a hangar is specifically designed for housing aircraft and provides protection from environmental elements, making it an appropriate location. The wash rack is intended for cleaning aircraft and is another suitable area for temporary parking. An awning serves as a cover but is not typically used for parking aircraft; however, it is generally not regulated in the same way as a runway.

Thus, the runway stands out as the least appropriate option due to operational safety and regulatory compliance.