Because of that the island is quite small and easy walking, may be better to rent a motorbike or a quad, particularly during peak periods. If you were to take a car, the only problem you can find is the parking. And of course, cars are more expensive to rent. To get an idea, bikes are about 15 € a day, quads, from 20 € to 25 €, and cars over 30 €.
It is very important to ask for prices in several car rental agencies (there are plenty of them around the island, especially in Fira), since price can vary greatly from one to another.
Even going in high season, there are no trouble in renting vehicles because the great amount of small rental companies.
Bear in mind that there are not many gas stations in the island, specialy in Oia, where there are no one. Nearest one is located at Fira.
