I guess it's not necessary to mention here FAR 91.307.

Aerobatics without a parachute pass the 91.307 test as long as you are alone in the aircraft. I bring this up only because sometimes walk-on rides request an "exciting" flight and it can be tempting to do what 91.307 would define as "aerobatic" without putting on parachutes - and being responsible for instructing the ride on how to safely use the parachute if the need arises. I (CFIG) certainly do not consider myself qualified to instruct on the use of parachutes.