The same rules apply as in Italy.
There are airports near Cagliari, Alghero and Olbia. See below for some links.
There are ferry services to Caglari (south coast), Sassari (north coast), and Olbia, Arbatax (east coast). See below for some links.
Public transportation is sparse and timetables unreliable. You definitely need to hire a car (una macchina). Beware the way locals drive: racing along the narrow and bendy roads in the hills.
In the summer period, twice a week, there's a small train that travels from Sassari to Tempio and back. It runs especially for tourists and is highly recommended.
Mirto is an alcoholic drink that's a local speciality.
Campsites: There are many Campsites all around the cost, most of them close at the end of September or early Oktober, but some are open around year. Prices get as high as 30-40€ in the Mid-Season (August) for a small tent, car and 2 people and tolerable in September/October to an average of 15€ (3-star-campsites).
For some serious night life, you obviously have to go to the big cities or the tourist beach places. In the small towns, the young people will get you to join in with their drinking games. You should join them since there's nothing else to do there anyway.