Naples has four passenger departure points on the waterfront and two more outside the city, and they send out entirely different boats. Turning up at Beverello for a Porta di Massa sailing costs you a fifteen-minute walk; turning up at Beverello for a Santa Lucia boat costs you the trip.
Molo Beverello is the hydrofoil and fast-ferry terminal, rebuilt in glass and steel at the foot of Piazza Municipio. Foot-passenger services to Capri, Ischia, Procida and Sorrento leave from here, and in summer the coastal fast ferries to Positano and Amalfi. It is the easiest pier to reach: Municipio station serves metro lines 1 and 6, and the ticket booths are about 300 metres downhill.
Calata Porta di Massa sits a kilometre east, past the Immacolatella. This is the car-ferry quay — Caremar to Ischia, Procida and Capri, and the overnight ships to Palermo and Catania. The boats are slower, considerably cheaper, and heavy enough to keep sailing on days the hydrofoils are cancelled. No metro serves the gate; it is a flat fifteen-minute walk from Beverello.
Mergellina is the western pier, four kilometres away at the end of the Chiaia seafront, with its own Line 2 station. Some Capri and Ischia hydrofoils run from here rather than Beverello, and the summer sailings to Ponza, Ventotene and the Aeolian islands are guaranteed from Mergellina. A voucher that says Naples and means Mergellina is the classic way to miss a boat.
Molo Luise and Borgo Marinari, on the Santa Lucia waterfront below Castel dell'Ovo, are marinas rather than terminals, and this is where the small tour boats load. Borgo Marinari is the islet of Megaride across a short causeway; operators there commonly meet passengers at the Lucio Dalla steps by the Royal Yacht Club Savoia. No metro reaches either, and it is fifteen minutes downhill from Piazza del Plebiscito.
Two departure points are not in Naples at all: the Baia semi-submarine leaves from Bacoli, twenty kilometres west on the Cumana railway, and the Pompeii and Amalfi shore excursion starts at Salerno port. Read the meeting point before the itinerary.