Here's old San Juan in GM.
http://maps.google.com/maps/mm?ie=UT...26093&t=h&z=15
The Fort on the western tip where all the grass is has some very cool roads and fort walls along the southern shore. The other fort is where it says Plaza des armas de San Cristobal.
If you are leaving Carnival or Holland America, you will probably leaving from the pier just south of old San Juan. If you are Royal Caribbean or Celebrity you will probably be leaving from the pier just North of the Airport although I did see 2 RC ships on the other side when I was there.
<Self Promotion>You may be interested in my site
http://www.nauticalcities.com</>