It is unlawful for any person to operate any watercraft at speeds in excess of seven knots within 300 feet of any swimming area, dock or park shoreline; or to approach closer than 100 feet to any such swimming area, dock or park shoreline, except for an emergency threatening life or property; or in areas designated by the city manager or his or her designee, or as necessary to access the property of the operator of the watercraft. (Ord. 4480 § 13, 1993; Ord. 4071 § 1, 1989.)