In addition to the zones, the Maritime Authority said they have increased funds for added patrols. Sorry, I forgot to mention that. As I said, they are taking this seriously.
I am not sure how big your lake is, but with the entire Caribbean just offshore, Jamaica probably has much more water area to create these zones making them of ample size for the noisy jet skis to buzz around.
But if your lake is big enough, this might work in your case...