Some parks are within the City limits of municipalities that prohibit OC - Example Babler State part is within the City limits of Wildwood, therefore you cannot OC there. The Park people don't have a problem with it, trust me, the Wildwood police do! If you have written permission from the park you could OC there, I tried to get it ( I walk in the park several times a week in the evening) , never going to happen.
There are a lot of State Parks, you have to check the local laws the park is in to get the lattest information.
Oh, nice shoot'n with you a few weeks ago, your good!