Good advice. As with any place, there are unscrupulous characters looking to take advantage of the unsuspecting. When someone sees you're from a "far-off land" it only makes it more enticing, as they figure you'll be leaving the country soon enough, perhaps never to return...and if they can get away with it for ten days, they're off scot-free, and you won't (or can't) press any charges.
I think it best to change $$ at the ATM and pay cash as possible for items. If you can keep an eye on your card at all times (i.e. at the counter of a store), you're usually safe.
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Ongi etorri!