constellation San Juan

does anyone know if they park in Pam Am pier if going just for a day on the cruise and not originating from there? Prefer to be in downtown if just for the day.

Unless there are a large number of ships in port for that day, all day stops are made at the piers in Old Town. The Pan Am pier is occasionally used for a day stop when all the piers in OAJ are full. You can get a good idea of how many ships are expected on a specific day at cruisetimetables dot com