When we are in San Juan we usually walk to Barrachinas.
It is a short distance from the pier.
It is a little indoor/outdoor cafe/restaurant.
They pride themselves as being the birthplace of the Pina Colada.
There is a brass plaque on the outside of the building attesting to the fact.
Pina Colada's are free for the asking.
Barrachina has a convenient FREE service for travelers.
If your ship finishes up the cruise in San Juan and your flight home in not until late in the day, you can drop your luggage off at Barrachinas and they will hold it for "Free", enabling you to tour the city luggage free.
When you return, present your luggage stub, retrieve your luggage, hail a cab, and you are off to the airport.
We have used their service many times with a hitch.