Being home to over 2,000,000 people, Lisbon is one of Europe's safest cities.  Having said that, it is a good idea to use the same safety common sense that one would use when visiting any city.  To avoid being pickpocketed, men should carry wallets in their front pockets and women should hold their bags by their bodies, not their straps, while walking or shopping.  Women should also keep a close eye on their bags while eating in restaurants or using public transport.  Hotel safes should be put to use to store valuables and money, and a photocopy, not the original, of your passport should accompany you when you go out.  Leave the original in the safe.  Carry only small amounts of cash and avoid wearing expensive jewelry and engaging in behaviors that thieves may notice, such as overtipping.