Is a public school conjoined to a city park not in session considered a public place where one can film?

Is a public school not in session the same as a public place I.E: a park where one can film/photograph provided no students are in the images or video.

This is a question about an indie no budget documentary film. Not a commercial film.


There is a park conjoined to the school a public city park. Further no identifying information like names, signs, or streets about the school is shown.

http://www.helpwantedflick.com and http://www.roxhart.com