Coming into the city from the east, take 27 de febrero expressway until the intersection with Ortega y Gasset. Turn right, and keep going straight across the JFK intersection and Ave. San Martin. Plaza de la Salud is on your left. You might have to follow the perimeter around to the street mentioned, Pepillo Salcedo, although I'm sure any entrance will do.
See the Santo Domingo map (penultimate) in this link - using the Estadio Olimpico on 27/O&G as a landmark. Plaza de la Salud is to the north of the stadium.
Boca Chica, Dominican Republic Maps