Embark on a coastal excursion to the nearby port city of Callao on the fifth day of your trip. Explore the historic Fortaleza Real Felipe, a colonial fortress that played a significant role in protecting Lima from pirates and invaders. Visit the Callao Naval Museum to learn about Peru's maritime history. Take a boat tour to the Palomino Islands, home to a diverse range of marine wildlife, including sea lions and penguins. Enjoy a seafood lunch at one of the local restaurants overlooking the ocean.