If you're into culture and history you have got to go to Old San Juan. This is the second oldest city in the western hemesphire and has been lovingly preserved. Walk thru it's cobble stone streets and marble at it's incredible well preserved spanish colonial architecture. While there don't forget to go to the following attractions: El Morro, Castillo San Cristobal, La Catedral San Juan Bautista, Casa España and the various museums in and outside of Old San Juan. Other historical cities in Puerto Rico are San Germán, Ponce and Aguada.