1) urinating on one's self (or one's friend) immediately. Hopefully, one is intimate with the one that needs to be "treated."
2) applying meat tenderizer.
Given the fact that most of us don't carry meat tenderizer on us and the immediate need to treat, unfortunately 1) is your best bet. Hey, you asked!
To the original poster - there are not usually dangerous sharks close to shore. In fact, in my 7+ years of diving there, I've never seen a "real" shark. Nurse sharks are a possibility, but they are docile creatures. Wearing Teva-type sandals decreases your chances of being injured by stepping on a spiny urchin. Putting your mask on in a sandy area, and immediately swimming (even in 2 feet of water) to the reef area decreases your risk of stepping on a spiny urchin. As others here have said - the sandy beaches on the north side are generally devoid of urchins in the shallow sandy areas, but they are abundant on the rocky beaches on the south side.
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