Carry a copy of your passport at all times as a form of identification.
All foreign nationals visiting Slovenia must register with the Police within 3 days of arrival or risk paying a fine. If you are staying at a registered hotel or guest house, they will register you when processing your arrival. If you are staying in self-catering accommodation, check registration arrangements with your booking agent If you are staying with friends or family, you or your host will need to visit the nearest police station to register your presence in Slovenia.
There are heavy on-the-spot fines for jaywalking.