CRIME: Crime, including violent crime, is a serious problem in Jamaica, particularly in Kingston. While the vast majority of crimes occur in impoverished areas, the violence is not confined. The primary criminal concern of a tourist is being a victim of theft. In several cases, armed robberies of Americans have turned violent when the victims resisted handing over valuables. Crime is exacerbated by the fact that police are understaffed and ineffective. Therefore, tourists should take their own precautions and always pay extra attention to their surroundings when traveling, exercise care when walking outside after dark, and should always avoid areas known for high crime rates. As a general rule, valuables should not be left unattended, including in hotel rooms and on the beach. Care should be taken when carrying high value items such as cameras, or when wearing expensive jewelry on the street. Women's handbags should be zipped and held close to the body. Men should carry wallets in their front pants pocket. Large amounts of cash should always be handled discreetly.
http://travel.state.gov/travel/cis_p.../cis_1147.html