Our Island has some wonderful lonely beaches, which would only be accessible if you had your own transportation. One of the most useful items you will need, is a map of the island, although you can't get lost, at least not for long. This is because there are few road signs around the countryside. However, if you are in doubt as to where exactly you are, just stop and ask someone. They will point you in the right direction.
Some car rentals have a age limit.
A 4 wheel drive vehicle is preferable, as some of the roads are not in exactly perfect condition. It is best to book in advance to ensure that you get the vehicle you want, as there is sometimes a shortage, especially during the high season.