Metropolitan San Juan includes the old walled city on San Juan Island; the city center on San Juan Island (called Puerta de Tierra), containing the capitol building; Santurce, on a larger peninsula, which is reached by causeway bridges from San Juan Island (the lagoon-front section here is called Miramar); Condado, the narrow peninsula that stretches from San Juan Island to Santurce; Hato Rey, the business center; Río Piedras, site of the University of Puerto Rico; and Bayamón, an industrial and residential quarter.
The Condado strip of beachfront hotels, restaurants, casinos, and nightclubs is separated from Miramar by a lagoon. Isla Verde, another resort area, is near the airport, which is separated from the rest of San Juan by an isthmus.
Finding an Address -- Finding an address in San Juan isn't always easy. You'll have to contend not only with missing street signs and numbers but also with street addresses that appear sometimes in English and at other times in Spanish. The most common Spanish terms for thoroughfares are calle (street) and avenida (avenue). When it is used, the street number follows the street name; for example, the El Convento hotel is located at Calle del Cristo 100, in Old San Juan. Locating a building in Old San Juan is relatively easy. The area is only 7 square blocks, so by walking around, it's possible to locate most addresses.
Street Maps -- Qué Pasa?, the monthly tourist magazine distributed free by the tourist office, contains accurate, easy-to-read maps of San Juan and the Condado that pinpoint the major attractions.