On your second day, take a day trip to the ancient city of Pompeii and Mount Vesuvius. Start by exploring the ruins of Pompeii, a once-thriving Roman city that was buried under volcanic ash in 79 AD. Wander through the well-preserved streets, marvel at the ancient buildings, and learn about the daily life of the Romans. Afterward, head to Mount Vesuvius, the volcano responsible for the destruction of Pompeii. Hike up to the crater and enjoy panoramic views of the surrounding landscape. In the evening, return to Naples and treat yourself to a delicious seafood dinner at one of the waterfront restaurants.