My guess is that three weeks of heavy enforcement would raise enough stink that every home owner would warn their guests and renters accordingly, and then people would start doing the right thing.
Regarding the comment by TechPyle about individuals owning most of the beach in South Walton, I'm curious to know where you get that information since no one at the county offices seems to know. My personal experience is that the property appraiser's site is wrong in many cases, and you must look up each individual deed, as well as every sub-division recording and attachments, since some developments started off with the HOA owning the beach land, but the recording notes that if the developer ever disolves, the ownership goes to each individual beach-front owner. So, you can't look solely at the original plat to know who actually has the legal deed to the property.
One other note to clarify property rights -- my understanding is that a renter of a property basically steps into the shoes of the owner, as far as usage rights of the property, so to say that a renter has less usage would likely be incorrect, in a legal sense. (I'm not a lawyer, and not pretending to be.)
I would like to see the beach remain much in the same way it was when most of us first saw it -- free of cheap plastic toys, large shovels, and tents. That is just me. Being very aware of the intense dangers of the sun, protection is needed in the way of shade, so I can live with tents and umbrellas, even if left out during lunch and high-rate cancer periods from 11am-3pm. However, when people leave the beach for the day, they should be considerate of others enjoyment and remove the items which they brought. If plastic toys/shovels/pales etc are brought, perhaps the parents could count the number of such items with their kids, and make the kids collect all of them when leaving the beach each time, even during lunch breaks. Being on vacation is no excuse for not being a good parent, teaching your children respect not only for others, but also of your surrounding/environment.