As a resident from Puerto Rico, I can tell you that grilling here is not as sophisticated as it might be. My impresion is that people here ignore almost everything about lava rocks, or the real importance of smoking the food. Take me as an example; all my life I've been using charcoal grills and I love it's taste. I got my first gas grill just three weeks ago, and by reading this forum I have discovered that I can have the same taste I was used to have. I don't think that so many people here in Puerto Rico really get into gathering information about grilling as to find what are lava rocks for example. In fact this is the first time I know about them and about the techniques to get smoke in a gas grill.
If you want to have any specific information about Puerto Rico, contact me at firstname.lastname@example.org