If you’re flying to the Caribbean, chances are you’ll be making a stop at the SAN JUAN AIRPORT. But what you might not know is that it’s a great little place to pick up some souvenirs, because while the city itself doesn’t offer duty-free shopping, Luis Muñoz Marin International has a nice selection of duty-free shops. Let’s see, I need some rum, some hand-rolled Puerto Rican stogies for Dad, some rum, a new Panama hat for Jon, some rum …