Most of the attractions are within walking distance, but you can also take a taxi or use the efficient public transportation system. Budget around 10 EUR for transportation costs and plan for approximately 30 minutes of travel time between attractions.
If you have extra time, visit the iconic Mount Vesuvius or take a boat ride to the nearby island of Capri. Conversely, if you have less time, consider skipping Castel dell'Ovo or Napoli Sotterranea. Don't forget to bring comfortable shoes, sunscreen, and a small bag to carry your essentials during the day.