Jill -
I think you did the right thing, telling security. If I were in your shoes about the only thing I would change would be what would get said to the idiot parents when they came back...
"Where's my kid?"
"I don't know [true, by the way]. I saw Security - they came & got her.[also true]"
and then I would have walked away. I would not tell them *I* turned them in, I would not tell them anything that I had done. And if they asked me "Well, did you get Security?" The best response would be another question, something "Why? What difference would that make? I'm sure you can ask the lifeguards how to get in touch with Security." and then I would have walked away.
I would have lised to their face, these people didn't deserve the truth, they simply misplaced their emotions and started in on *you* Jill.
Classic behavior...it's always someone else's fault with people like that. They're probably posting on some Internet message-board right now about the busybody who interfered with their vacation. The fact that their kid *didn't* have sun-poisoning, their kid wasn't abducted, that their kid was alive and didn't suffer any harm because YOU chose to act?....doesn't even enter their universe.
agnes!