I was stung by a jellyfish swimming in the waters off cupecoy beach many years ago. I was alone at the time and got out of the water. I poured fresh water on the sting and packed it with wet sand. I always have benadryl in my beach bag and took a few. I was staying at the summit hotel at the time and informed the staff I was stung by a jellyfish. It was not a pleasant experience but nothing that would keep me from swimming a few days later.