Cuba is the most populous country in the Caribbean.  The island has a tropical climate but prone to frequent hurricanes. With Michael Moore's movie Sicko, more people are aware of inexpensive cuban healthcare system. The medical tourism product in Cuba has evolved over the last four decades. In 2005, there were 70,594 doctors, 21 medical schools, 14,078 medical clinics, 470 polyclinics, 255 hospitals, 13 medical research institutions and 165 stomatology clinics for the treatment of diseases of the mouth. The country currently collaborates with more than 80,000 institutions in 97 countries in the field of medicine. 

Cuba’s medical tourism products and services are disseminated by Cubanacan Tourism and Health, which provided care for a total of 19,670 tourist patients in 2006. As stated by President Fidel Castro Ruz, Cubanacan is based on the principle that “every person and every nation has the right to a healthy life and to enjoy the privilege of a prolonged and useful existence,” and “Cubanacan Tourism and Health places at the disposal of all interested persons anywhere in the world, the advancements of the Cuban health system.”

Although the government of Cuba permits U.S. citizens to visit, the U.S. itself restricts its citizens from travelling there, except with a license issued by the Treasury Department's Office of Foreign Assets Control. The specific restriction is against spending money in Cuba, however U.S. authorities consider any visit of more than one day to be prima facie proof that one has spent money there.

Source: CaribeanNetNews, Wikipedia