Remember, the cop is the superfluous in the legal machine. No matter where you get your ticket; albeit in a park, your car, your home, or on the street, just take the ticket and keep your mouth shut. You win and lose your legal battles in court, not with a cop. 95 percent of the time, if you play your cards right, you can get out of every ticket and citation given to you. There is a myriad of ways to beat the legal system if you have the patience to do so. Cops aren't your problem, they're just like bad acne - it's ugly, annoying and it goes away. Take your fight to the court.
If you need help fighting, there are several people in the disc golf community who can show you how to interpret laws and ordiances to develop a legal defense against trivial charges.