Sharpen your senses and get streetwise
The millions of visitors to Mexico mostly have an enjoyable trouble free time, however as a poorer nation there is a lot of petty crime. It is generally recommended that you leave your valuables at home, dress down and go with the flow while taking sensible precautions to keep to the main tourist and business districts, and avoid walking out alone at night.
Since 2006, the Mexican government has engaged in an extensive effort to combat the drug-trafficking organizations (DTOs) that ship drugs to The USA. Mexican DTOs, meanwhile, have been engaged in a vicious struggle with each other for control of trafficking routes. In order to try and get a handle on the problem the government of Mexico has deployed military troops and federal police throughout the country. Visitors and citizens should expect to encounter military and other law enforcement checkpoints when traveling in Mexico you are urged to cooperate fully.
DO be aware that DTOs who are criminal gangs have erected unauthorized checkpoints, and killed motorists who have not stopped at them. In confrontations with the Mexican army and police, DTOs have employed automatic weapons and grenades. In some cases, assailants have worn full or partial police or military uniforms and have used vehicles that resemble police vehicles. According to published reports, 22,700 people have been killed in narcotics-related violence since 2006. The great majority of those killed have been members of DTOs. However, innocent bystanders have been killed in shootouts between DTOs and Mexican law enforcement or between rival DTOs.
The most serious and persistent security concerns the areas of to Michoacán and Tamaulipas, to parts of Chihuahua, Sinaloa, Durango, and Coahuila and to advise anyone traveling in those areas must exercise extreme caution.
While crime in Mexico is a problem particularly in Mexico City and the US border region. Violent crime and, more specifically sexual crimes against women are increasing and as in most countries the most commonly reported crimes involve theft such as pick pocketing, purse snatching, armed hold ups, credit-card fraud and ATM robberies and even kidnappings targeting travelers in the Nuevo Laredo region of northern Mexico so travelers should be extra vigilant.
Take the usual precautions and good when traveling. Mexico's sanitation is poor in some areas with risk of water borne diseases. Don't drink tap water unless you know its safe, avoid bug and snake bite, take it easy on mescal and you should be ok.
As well as the embarrassment when your nude photos show up all over the internet because you drank too much tequila and made an exhibition of yourself, STD's are rampant, so if having sex with locals or other tourist, take precautions.
The time of highest risk is during spring break when US students flock to places like Acapulco in great numbers. Everyone gets drunk and this event has become a ritual for thousands of kids to let loose, get drunk and have lots of sex that they may not remember after.