I've seen numerous photos and heard a number of stories about Jelly Fish, Sting Rays, and Sharks. Are these three sea creature really this common in PCB? I understand the jelly fish being evident in the waters, but are sharks and sting rays common and if so... are they usually harmful or dangerous? Also, is there any Jelly Fish within the waters in PCB that are deadly or very harmful? I like going out to the sandbars and after reading some things, I don't know if it's so safe.