We're now considering renting a car in Split and using it to get to Ljubljana (and sight-seeing around Solvenia), returning to Pula (modest drop-off charge, worth the convenience). So the rental itself is all within Croatia, but not the week's travel. Is there anything we should watch for in taking the rental car across the border into Slovenia (& back) from Croatia?
Also, is an International Drivers License required/recommended? We recall needing one for Spain a few years back -- but not for France or Ireland. Thanks!