Hydrofoils and ferries connect Naples and Capri in less than an hour for most of the year. If you want to take a day trip to Capri from Naples, you can also book a boat tour that includes the crossing plus a cruise around the island.
The most popular boat tours from Naples are group tours that include pickup from meeting points across the city and beyond, transfer to the departure port (often Ercolano or Torre del Greco), and a boat tour that includes a cruise around the island of Capri that passes below the Faraglioni. Boats dock at the port on Capri, Marina Grande, and passengers can enjoy free time to explore on land. Some tours also include a guided visit to the island. From June to September, you can opt for a tour that includes a stop to swim or snorkel.
There are also private Capri boat tours from Naples if you prefer more flexibility and the privacy of having a boat all to yourself. Private boat tours generally can fit up to 12 passengers and the itinerary can be personalized to your interests and pace.