This family-owned coffee shop, located in the southeast corner of the massive Ballaja Barracks, provides an opportunity to pause and really soak in the vibe of the Ballaja Quarter of Old San Juan. Don Ruiz serves simple pastries and sandwiches, but is best known for offering single-farm, single-harvest gourmet coffee. The coffee is grown in the Ruiz’s 200-year-old family farm in Yauco, an iconic coffee town in the island's mountainous southwest. Their medium-dark roast preserves the subtleties of taste associated with that region's heritage coffee farms. Saturday mornings are the perfect time to visit because not only will you enjoy the sounds of musicians practicing, there's a nearby farmers' market to explore after breakfast. Locals stop by the café throughout the day to grab their daily cup and a delicious bite at this favorite spot.