Beware pickpockets. The Cammora are in charge of most of the crime in Naples and the city is notorious for its pickpockets. Have your wits about you especially on public transport like the buses or metro's, if on a bus try to get a seat as pickpockets will often surround their standing target in a gang of three and take your pocket contents and pass it to their partners in crime. This is because when standing in an overcrowded bus you are less likely to notice anyone nudging or touching you. They will often attempt to pick your pocket as you get off the bus, if you catch them in the act they will retreat but it is best not to confront them, they are armed and will mug you if guile doesn't work. So have zip pockets, try not to look like a dopy tourist like I did, i kept my wallet and saw the pick pocketers off but they got onto my bus because i was obviously a tourist. Find seats on public transport or keep an eye on those around you. Don't take shortcuts through small alleys, especially in rough areas. Muggings are common, the pickpockets will often throw something into the face of the victim like newspaper and whilst they are disorientated take their valuables and pass them on to runners, violence isn't often necessary but they will use force if it calls for it. So best advice is be sharp and ready because Naples is a rough spot and not your normal kind Italian destination! It is a far leap from the peace of Sorrento just a few miles away.