https://en.wikipedia.org/wiki/List_of_places_where_social_nudity_is_practised
Socialised, non-sexualised nudity, has never been proven to create harm. There is no scientific, nor studies of a psychological nature, which conclusively states abnormal conditions as related to it. In Europe, Asia, and the South Pacific, non-sexualised social nudity is part, and parcel of the societe.
https://naturistphilosopher.wordpress.com/2015/02/01/benefits-of-social-nudity-body-acceptance/
Therefore having "clothing optional" parks and beaches will not results in an abnormal burden on American societe. Naturists are people with a proven record of self policing behaviours amongst themselves A comprehensive list of societal benefits are listed:http://www.scientificamerican.com/article/nudity-found-to-have-new-benefits/
States, cities and all municipalities shall therefore designate certain areas of beaches, parks, and other areas as "clothing
optional."
Social nudity should be normalised in the United States. There is no evidence that non-sexualised nudity creates an abnormal burden in general societe. Therefore, beaches and parks, should have clothing optional areas.