When you log into a hotel, hostel, campsite or apartment, you'll automatically be registered with the police, as required by law. If you are staying with friends please do it yourself. During the period of 24 hours, check with your nearest police station and do not forget to bring your passport. You will be kindly asked to fill out some paperwork, a procedure necessary for your personal safety and that helps you overcome any inconvenience that may occur while you are on vacation.