If you stay in the Condado area, you can walk to the many restaurants and shops.  We stayed at the Coral Princess Inn, which is an excellent bed and breakfast hotel.  You can take a bus for 75c to Old San Juan, Isla Verde, Ocean Park, Hato Rey and the the mall (Plaza las Americas), where they have a cinema.  The buses are every 15-30 minutes, depending on the route and day of the week. 

Old San Juan

You can easily walk around Old San Juan to look at all the historic sites.  There are two free trolley routes that will take you most places if you get tired.  Some of the roads are hilly. 

Helpful Links 

If you need map and driving instructions is highly recommended you visit the Map and Directory site of  Puerto Rico