If you have any kids under 18 they need a helmet. Everyone needs eye protection. Here is the actual law.
28-964. Motorcycles; all-terrain vehicles; motor driven cycles; equipment; exception; prohibition
A. An operator or passenger of a motorcycle, all-terrain vehicle or motor driven cycle who is under eighteen years of age shall wear at all times a protective helmet on the operator's or passenger's head in an appropriate manner. The protective helmet shall be safely secured while the operator or passenger is operating or riding on the motorcycle, all-terrain vehicle or motor driven cycle. An operator of a motorcycle, all-terrain vehicle or motor driven cycle shall wear at all times protective glasses, goggles or a transparent face shield of a type approved by the director unless the motorcycle, all-terrain vehicle or motor driven cycle is equipped with a protective windshield.