In every touristic place there is an underground chain of frauds that just wait for new tourists and try to rob them the best way they know. The frauds work very smartly and sometimes it is even difficult to find out when and how exactly you were robbed.
There are certain tips for anyone, who travels in a new destination. Rule number one for your safety stay is never to exchange money in cabs. Try to exchange your money in a local currency only in a bank or licensed offices.
In case you are going to rent a car, always test the vehicles first, because there are some swindlers, which are giving you intentionally damaged cars, and later you will have to pay the insurance.
Make sure no one sees the pin-code of your card and be aware that in some restaurants they have a data-reader for taking the codes of your credit card.