[Hectic]

No you cannot play on public land.
If its private property you or someone you know owns you could play there provided you cant bee seen from the road and the land owner has proper commercial liability insureance. Just check the game schedual and go to a game at a proper field. Also if you go runing around in public with your "toy gun" you will wind up with a verry real gun stuck in your face and some nice bracelets for your wrists