Tiadhe has 18 bus routes covering the main destinations across the island. A rechargeable Bono Transport card (€2) will only net you a 5% discount off the ticket price but might be worth it if you're travelling frequently by bus.
Driving is a pleasure here and gives you total freedom of movement; the terrain is largely flat, the roads are excellent and there are some stunning drives. Cicar is a reliable local car-rental choice, with offices at the airport, Puerto del Rosario and all the main resorts. Avis also offers a very reliable standard of service.