From the CDC concerning Malaria Risk
Malaria Risk by Country
Mexico: Risk in rural areas, including resorts in rural areas, of the following states: Campeche, Chiapas, Guerrero, Michoacán, Nayarit, Oaxaca, Quintana Roo, Sinaloa, and Tabasco. In addition, risk exists in Jalisco State (in its mountainous northern area only). Risk also exists in an area between 24° north and 28° north latitude and 106° west and 110° west longitude which lies in parts of the states of Sonora, Chihuahua, and Durango. No malaria risk along the United States-Mexico border. No malaria risk in the major resorts (that is, resorts located in urban areas) along the Pacific and Gulf coasts, although tourists should use insect repellent and other anti-mosquito measures.
Panama: Risk in rural areas of three provinces: Bocas del Toro, Darién, and San Blas. No risk in Panama City or in the former Canal Zone.
Colombia: Risk in all rural areas at altitudes lower than 800 meters (2,624 feet). No risk in Bogotá and vicinity.
Travelers to Bolivia, Brazil, Colombia, Ecuador, French Guiana, Guyana, Peru, Suriname, and Venezuela should take one of the following antimalarial drugs: (listed alphabetically): atovaquone/proguanil, doxycycline, mefloquine, or primaquine (in special circumstances).
Caribbean
Haiti: All areas, except no risk in cruise port of Labadee (Labadie).
Dominican Republic: Rural, with highest risk in provinces bordering Haiti. In addition, risk in all areas of La Altagracia Province, including Punta Cana and Bavaro Beach(Updated October 21, 2005).
Jamaica: Risk in the city of Kingston only. (Updated December 4, 2006)
There is no risk for malaria on other Caribbean islands listed. (Updated September 19, 2006)