Except as authorized by law, and except as provided otherwise in Sections 11353.1, 11353.6, and 11380.1 with respect to playgrounds situated in a public park, any person 18 years of age or older who unlawfully prepares for sale in a public park, including units of the state park system and state vehicular recreation areas, or sells or gives away a controlled substance to a minor under the age of 14 years in a public park, including units of the state park system and state vehicular recreation areas, during hours in which the public park, including units of the state park system and state vehicular recreation areas, is open for use, with knowledge that the person is a minor under the age of 14 years, shall be punished by imprisonment in state prison for three, six, or nine

years.