On your second day, venture out of the city to explore some of the nearby attractions. Start your day with a visit to the Castillo de San Marcos National Monument, a historic fort that offers breathtaking views of the city and the ocean. Take a guided tour to learn about the fort's role in protecting St. Augustine during various conflicts. Afterward, head to the St. Augustine Lighthouse & Maritime Museum, where you can climb to the top of the lighthouse for panoramic views of the area. Explore the museum's exhibits to learn about the city's maritime history. In the afternoon, visit the Fountain of Youth Archaeological Park, where you can sip from the legendary fountain and explore the park's beautiful gardens. End your day with a relaxing dinner at a waterfront restaurant.