Isola del Giglio is connected to Porto Santo Stefano (on the Argentario peninsula, 2 hr. by car from Rome or Siena) by MareGiglio, in Giglio Porto at Via Umberto 1 (tel. 0564/812920; www.maregiglio.it), and Toremar (in Porto Santo Stefano, tel. 0564/810803; in Giglio Porto, tel. 0564/809349; www.toremar.it). The trip takes about an hour and costs 10€ each way. In summer, there are up to 15 boats per day; off season, there are at least three daily sailings. Maregiglio also runs a few boats per week between Giglio and Giannutri (1 hr., 9.50€ each way). From mid-July through the end of August, a permit is required to bring a car to Giglio (inquire with your hotel or apartment agency when booking, or call the Comune of Isola del Giglio at tel. 0564/806064). Normally, this just means paying a small extra fee to the ferry company.
Though Giglio's main towns are served by reliable buses, a car gives you more freedom to explore those paved and dirt roads not served by public transportation. Upon arrival, you can rent a car from Andrea Ansaldo, Giglio Porto (tel. 340/8732865). Andrea also rents scooters, or you can try Giglio Multiservizi, Via Umberto I, 26, Giglio Porto (tel. 0564/809056). Buses, which link the three towns of Porto, Castello, and Campese, are run by Autolinee Brizzi (tel. 0564/807620; www.autolineebrizzi.it). Buses run in the evening, although not as frequently. At night, taxis are often a necessity, since most of the evening action is in Castello, and not within walking distance of most hotels; expect to pay between 10€ and 15€ for trips between Porto and Castello or Campese and Castello. Some numbers to try are tel. 340/8732865; 338/9706950; 347/1941888; or 330/731424. Giglio is small, and the cabbies tend to be the same guys who rent cars and scooters.
Handy boat service to the beaches (10€ round-trip, or 5€ one-way) is offered all day from 8am to 7pm from the Boatmen (www.boatmen.it) kiosk next to the ferry landing in Porto. When, in high season, the beaches are overcrowded, the guys at Boatmen will also take you to secluded coves where you can throw a towel on the smooth granite and have a back-to-nature day of sun and surf. Private taxi-boat service can also be arranged from Boatmen at Giglio Porto to anywhere on the island; you can usually just find their orange kiosk at the harbor, but if you want to book their services in advance, give Mauro a call at tel. 349/3508493. In summer, Boatmen offers a 2 1/2-hour giro isola island circumnavigation tour (20€) around Giglio (departure from and return to Porto), with a stop for swimming. You can also rent your own small gozzo or gommone at Porto; expect to pay about 50€ for a half-day's rental, which is plenty of time to cruise around the island's perimeter, stopping at various coves for swimming and picnicking along the way. There are numerous agencies -- just look for signs marked noleggio barche -- but Alvino (tel. 347/0547755) at Boatmen is a good place to start.
The Pro Loco Giglio office is at Giglio Porto (tel. 0564/809400; www.isoladelgiglio.biz). Pick up the indispensable Pro Loco Isola del Giglio map, which is marked with hiking paths, elevations, and the principal coves and beaches for boating and swimming.
Note: This information was accurate when it was published, but can change without notice. Please be sure to confirm all rates and details directly with the companies in question before planning your trip.