Minimize consumption of alcohol: Driving vehicles drinking alcohols is not a good thing. There have strict rules and regulations to prevent drivers from drinking alcohol so that they can drive the vehicle safely. Traffic police conduct breathalyzer test or blood test in many countries to know the percentage of alcohol in your blood. If they find you guilty you may go behind bars while driving a rental car or any other vehicle. Breathalyzer tests are also conducted to know the breath rate of a drunk driver. So, a driver must make himself refrain from drunk driving in order to avoid the legal hassles.
Abide by the traffic rules: Traffic rules have been devised to bring control over the accidents and maintain discipline while you are driving vehicles on the roads in a crowded city. But you will have to abide by the traffic rules otherwise you may court troubles violating the traffic rules in Santorini Island.
Keep your Driving Permit with you: Be it your native place or a foreign land, traveling with rental cars without having an international driving permit is not right at all. You may face legal hassles for not having the driving permit. You must check the validity of the permit while going on a long vacation to a foreign land so that you will not land in hassles for an invalid driving license.