Knowing vocabulary as well as verb conjugations is very important when studying any language. With Vocabulix you can drill verb conjugations in many languages, such as German or Spanish.
University of Guadalajara Foreign Student Study Center (CEPE) - since 1948, currently 2,500 students per year from a wide variety of nations. CEPE helps students who wish to learn the Spanish language and aspects of Mexican culture through immersion studies.
Instituto Intercultural del Caribe: One of the largest language institutions. Either in the Caribbean-style metropolis Santo Domingo or in small sea town of Sosua since 1994.