To truly experience Sardinia, a rental car is almost essential. While the island has a regional bus network (ARST) and some limited train lines connecting major cities like Cagliari, Sassari, and Olbia, the public transport is designed for local commuters rather than tourists. Many of the island's most famous "hidden" beaches, such as those in the Costa Smeralda or the rugged Gulf of Orosei, are completely inaccessible by bus or train. Having a car allows you to navigate the winding coastal roads at your own pace and reach the traditional agriturismos (farm stays) in the mountainous interior where the "Blue Zone" culture is most authentic. If you choose to rely on public transport, you will find yourself tethered to a few main hubs and dependent on infrequent schedules that often stop running early in the evening. In 2026, travelers are advised to book a small car, as the streets in ancient hilltop villages like Castelsardo are incredibly narrow and difficult to navigate with a large SUV. While you can survive without a car in a city like Cagliari, you would be missing out on the vast majority of the natural beauty that makes Sardinia a world-class destination.