Capri is well connected with the mainland in all seasons, though there are more sailings between April and October. However, you can't return to Naples after the last sailing (11 pm in high season, often 8 pm or even earlier in low season). Hydrofoils, Seacats, and similar vessels leave from Molo Beverello (below Piazza Municipio) in Naples, while far less frequent car ferries leave from Calata Porta di Massa, 1,000 yards to the east. There's also service to and from Sorrento's Marina Piccola. Much of Capri is pedestrianized, and a car is a great hindrance, not a help.
Several ferry and hydrofoil companies ply the waters of the Bay of Naples, making frequent trips to Capri. Schedules change from season to season; the most reliable source for departure times is Il Mattino, Naples's daily newspaper. There's little to be gained—sometimes nothing—from buying a round-trip ticket, which will just tie you down to the return schedule of one line. Book in advance in spring and summer for a Sunday return to the mainland.
Most of Capri's sights are reasonably accessible by either boat or bus, except for Villa Jovis and Cetrella, which require some walking (about 40 minutes). The bus service is relatively cheap (€1.80) and frequent, while taxis are likely to cost 10 to 20 times as much as public transport. Don't buy a biglietto giornaliero (day pass) for the bus and funicular unless you're thinking of covering almost every corner of the island—it costs €9.60, so you would need to make six separate trips to make it pay, and locals deem it a bit of a rip-off.
Alilauro. From Easter to October, Alilauro, through offshoot Alicost, offers three jet foils from Positano and Amalfi (approximately €20, travel time 50 minutes). Capri. 081/4972238. www.alicost.it.
Caremar. Caremar has up to seven ferry departures per day from Calata Porta di Massa (€12.70 slow, €17.80 fast with a travel time of 1 hour, 20 minutes). Three ferries leave daily from Sorrento (€14.70, travel time 25 minutes). Capri. 892/123 or 081/8370700. www.caremar.it.
Linee Marittime Partenopee. Linee Marittime Partenopee, also known as Gescab, has one to three hydrofoil departures every hour from Sorrento (€16.80, travel time 20 minutes) and one hydrofoil per day from Ischia (in the morning, €18, one hour). Capri. 081/8781430 or 081/8071812. www.consorziolmp.it.
Navigazione Libera Del Golfo. From Naples, Navigazione Libera Del Golfo has roughly one hydrofoil departure per hour from Molo Beverello (€19, travel time 40 minutes). Capri. 081/5520763. www.navlib.it.
Rent a Scooter. Conveniently located at the traffic hub of the island, Rent a Scooter offers scooters from €25 for two hours (add €5 in August). Via Roma 70, Capri Town, 80073. 081/8375863.
SNAV. SNAV offers one or more hydrofoils every hour from Molo Beverello (€20.10, travel time 40 minutes). Capri. 081/4285555. www.snav.it.