CAR RENAL: very expensive, on the airport Hertz (firstname.lastname@example.org) and Intercidades Rent a car, about 50-100 EUR per day, on rentalcars webpage even 110 EUR per day
Better to rent a car with your hotel reception, prices are 50-55 EUR per day, unlimited kilometers.
EU driving license accepted. No need for International Driving License.
ROADS: In good conditions, little traffic, no radars, limited number of road signs, take your GPS.
Rather safe and easy driving.
PETROL STATIONS: are everywhere, gasoline expensive 1,2 EUR per liter.
Many speed bumps, and some of them not ot badly marked.