http://www.casabacardi.org/ Bacardi’s largest distillery that was once located in Cuba and moved to Puerto Rico with the influx of the communist regime. We usually park at the Catano Ferry dock and ride the ferry ($1.00) round trip per person into Old San Juan to avoid the parking nightmare in OSJ.
Casa Bacardi now offers a $12 factory tour that includes a rum drink in a keepsake cup, $45 Mixology tour where you learn to mix 3 of the most famous rum drinks (Cuba Libre, Mojito and Pina Colada) or a $45 Rum Tasting tour where you learn the nuances of the different rums that Bacardi creates.
Between Casa Bacardi and the Ferry is a large yellow building and the public parking lot is just to the west of the building. It is easy to see on the satellite google map of the area.
The Catano Ferry (La Lancha de Catano) runs every ½ hour from Catano to Pier 2 in Old San Juan. The ride is about 8 minutes long. It doesn’t go by any of the "sites" of Old San Juan, but you can see the old city wall, the San Juan Gate and El Morro in the distance, also you can view Casa Bacardi and Isla de Cabras on the trip. The bay next to the ferry occasionally has manatee feeding so be on the lookout.
The fare is $0.50 each way. People aged 60-74 years pay 25¢ and seniors (75+ years) are always free. You can buy your tickets at the ferry terminals. Extra baggage/stuff (like bikes/ice chests) also have a small fee.
There is also a decent Puerto Rican restaurant right in the Cataño pier area called Don Tello. We have not been there, but I hear that the food is good and inexpensive, and the restaurant has a good view!