Ostra Cosa, a Spanish-Caribbean seafood restaurant located in San Juan, Puerto Rico, offers a diverse menu with many vegetarian options. With a full bar, outdoor seating, and live music, this restaurant is perfect for a casual dining experience. Customers rave about the delicious food, including the salmon with mofongo and the chuleta can can. Despite a few negative reviews regarding pricing and service, the overall consensus is positive, praising the excellent service and ambiance. If you're looking for a great dining experience in Old San Juan, Ostra Cosa is a must-visit spot.