Walton County Ordinance
Sec. 22-40. Regulation of use and conduct on the beach.
(f) Use of rafts, floats, and other flotation devices. Noperson shall:
(1) Use any raft, float, body board, or other flotation device of any description, except for a vessel or sailcraft, more than 500 feet from the water's edge.
One of the suggestions to avoid possible shark attack is to stay near shore, and make sure that many others are in the water around you. This girl was reported to be 250yards (750ft) from shore when she was attacked. It really stinks that she was attacked. I heard a surfer who was once attacked in Hawaii say that the sea is a great big wilderness filled with wild animals. I think his statement is ringing true.
edit - most reports are now stating that the two girls were only 100 yards from the beach. Reading about the large group of sharks seen earlier this year, I notice they reported the sharks coming within 25 ft from shore.
I stopped going out too far into the water after watching Jaws for the first time many years ago.