Free: Contests & Raffles.
I'd hammer the place until nothing ever came back, and not worry one bit. If folks can get away with flooding the fields, using electric ice eaters, and charging cash, then I'd say 'my property, my rules'. Getting to where I don't give a rat's A anymore.
Go harvest the geese no difference between this and hunters that park their butts on the edges of alfalfa fields for deer.
Well you sure would never know it was illegal to hunt the edges of alfalfa fields during archery season with the number tree stand and blinds that get put up.