I suspect the latter. A short fence around the beaches a few feet from the water line should be enough, and would look attractive enough (heck, the shoreline with it's water weeds and puke green water is ugly as it is), and signage everywhere else.
Or, they may just get rid of the beaches...which would be fine except for places like CBR, Yacht and Beach and Poly, where it's part of the "theme"...
Or, if they REALLY wanted to do it right, they could wall it off and make a shoreline that is really a pool that is elevated above the lagoon with it's own isolated water...but, that would be big buckaroos...
Google Ninja gator.