El Mercado is in a strip close to The Salvation Army. The grocery next to Harbor Freight/Office Depot is Britos.
My recommendation is Los Pueblos, opposite McDonalds on Greensprings, directly next to the fishmongers. All the local workers eat there, and the food is cheap and delicious. I swing by for great deals on fruits, peppers and masa.

I'm right with you. I've been hunting it down since I saw the episode.

I'm envious of your trip. I spent a week on the neighboring island of Culebra in 2008. Stunning.

Whilst I don't have a recommedation for a fine dinner, I'm afraid - I couldn't leave the thread without giving a shout out to La Bombonera, for breakfast or lunch. A hard working, bare bones diner, with incredible coffee, mallorcas (traditional pastries) and sensational rice & beans.