I saw that and understand what you mean. I know it says " public swimming beach" but from experiences of friends and others such as FWC , many say it's more like " from land" and not public beaches. So in other words, a mangrove area is considered a " beach" since it's public property even if it's on private property. Just and example. Take into consideration that mangroves are on the water and considered state property " technically " bc they are so protected. I hope that made sense.
All in all, it's better to stay away from that then to possibly go to court. Remember , FWC officers don't know the law sometimes and if it's iffy they will just fine you anyways.
It's sad to say that but it's true and it's what we live in today. This happens even on the streets. Probably a few can relate to that.
And please, I hope I didn't seem like I was attacking you or anything, that was not my intention. I just have a passionate love for the ocean.