Stuff you do for fun that you wouldn't mind discussing with your grandma (which rules out some of the stuff you do for fun and/or as a stress reliever) is fair game on the AMCAS. Reading your AMCAS, the adcom member should come away with some idea of you as a person. You are not just your transcript & academic scores. The LORs don't capture the essence of you. The PS and the experience section are the places where information that sets you apart from the 100s of other applicants belongs.
It is always fun to see that someone has done something unusual whether it is to have competed in a state beauty ("scholarship") contest, worked at a major league ball park, or starting a campus business. Seeing an application from a singing telegram clown would really cheer up an adcom member. Just don't wear the costume when you pose for your application "head shot".