Each place has common crimes and scams. If you are aware before you visit you wont find yourself caught by surprise. Always ask the locals as they will know better than anyone.
Please beware of people selling tickets outside the theatres for shows (especially ones that are sold out!). If it is to good to be true it normally is!
The three card monte is a world wide con, anytime you see a man with shells or cards on a paper box, feel free to watch from a safe distance but never ever put your money down, it’s a sucker bet and you are sure to lose.