HI Ken
I read the first page of the flyfishing forum you provided. If it were me, and I wanted to pursue this, I'd talk with the local police and invite an undercover officer on a fishing trip then head back into the cove with the officer on board when you know the gentleman in question will be there.
I assume that the suggestions of carrying a weapon or have an armarda of fishermen in the cove were in jest because that would hurt your case, not help it.
If the local police are interested as you say they are this may not be the first time they have had a complaint against this guy. Make the offer to have the detective join you, leave your 3 year old at home and let the cops handle it. (If the locals won't or can't go for one reason or another, liability comes to mind, maybe you know an officer who likes to fish from your home town, or someone elses? The testimoney of an off duty police officer is usually not disregarded by brother officiers)
Just my $.02
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