If someone is working that area looking for targets of opportunity, it might be fun to set up a beach chair and umbrella as an incognito stakeout.
Volunteers could set up shifts and take turns for the sake of the the community. Stick your GoPro on a stick in the sand under your umbrella for extra evidence.
Sitting at the beach in the shade is not a bad way to spend the day.
When the culprit is caught in the act, give him a suitable and justifiable beat-down then tie him up with an anchor rope and sit on him until the police arrive to arrest him. If he tries to get away, gaff him.
Post the video of your trophy catch in the Manly Man thread
