Up here, with a small population and endless miles of coastline, we still
have a problem.
Every half decent beach where a human may show up has 'Dogs must be on
leash' signs.
I'll take my Springer Spaniel out to an area about half an hour away that
has a series of nice sandy beaches and cool ocean water less than a half
hour drive from my house. The signs are up but enforcement seems to be
minimal...probably when a complaint is called in...or if you happen to run
into enforcement by accident.