On your last day, take a day trip to nearby San Diego. Start by visiting the world-famous San Diego Zoo, home to a wide variety of animals from around the globe. Explore the different exhibits and enjoy interactive experiences. Afterward, head to Balboa Park, a cultural hub with beautiful gardens, museums, and theaters. Take a leisurely stroll and soak in the vibrant atmosphere. End your trip with a delicious dinner at one of San Diego's renowned restaurants before heading back to National City.