Don't take your car unless you really need it. If you want to get around, take the bus or walk. On the Greek island of Hydra there are no motorised vehicles at all, so if you want to get around the island and you don't want to walk you will have to take a... donkey. If you think donkeys are impractical, why not try cycling? If we cycled more while on holiday we would be healthier and the environment would be cleaner.