Sorrento has two harbours a kilometre and a half apart, and the one called small is the big one. Every scheduled boat uses Marina Piccola; Marina Grande is a fishing village with restaurants, a beach and no ferry.
Marina Piccola sits below the cliff on the northeast side of town and is the working port. Alilauro and Gescab, NLG, Caremar, SNAV and Laser Capri all berth here for Capri, the Positano and Amalfi boats use the same stretch of quay, and the cruise tenders land here too. On a morning with two ships anchored off, the lift queue and the hydrofoil queue are the same queue.
Getting down takes one of three forms. Via Luigi de Maio drops from Piazza Tasso to the port in about ten minutes on foot, downhill all the way, and it is the road the buses and taxis use, so you walk it with traffic beside you. The Sorrento Lift runs from Piazza Francesco Saverio Gargiulo at the western edge of the Villa Comunale, straight down through the cliff and out by the beach clubs: €1.20 single, €2.20 return, €1.70 if you are carrying luggage and €0.50 per extra bag, according to the operator at sorrentolift.it. It opens at 07:00 all year, closes at 22:00 from April to October and runs to 00:30 through the summer — open before every early departure and still open when you come back. Third, EAV's circular lines B and C connect the Circumvesuviana station and Piazza Tasso with the port for €1.20, or €1.60 for the sixty-minute integrated ticket — bought at a tabaccaio or the station, never on board.
Marina Grande is the older harbour, west of the centre, reached from Piazza Tasso down past the Hotel Bellevue Syrene and through the Porta Marina Grande — a fourth-century-BC Greek gateway, the oldest built thing in Sorrento. Fishing boats, a handful of seafood restaurants, a small beach and private skippers who board their guests there — but no scheduled sailing of any kind. If your voucher says Marina Grande, you want the gate and the steps, not the lift. EAV line D is the bus that goes there, and it is a different line from the ones that serve the port.
The fourth address on this page is not in Sorrento at all. The Blue Grotto and lunch day is filed under Piano di Sorrento and boards at Marina di Cassano, four kilometres east: two stops on the Circumvesuviana, then a walk down to the harbour. A five-minute drive, and a thirty-minute mistake.