content: Having been told this straight up, most parks are not 'public.' In fact, other than streets with their accompanying sidewalks, you'll be hard pressed to find any truly public spaces. Most parks are 'city/county/state/national property,' which means they (the owning city/county/state/fed) can set the rules they want for people accessing them. It's how, for instance, a city can give you a criminal trespass warning for a park. Take a wild guess how I know this.