European festivals definitely bring a completely different energy compared to the ones in the US. Romania is a massive country with winding roads, so you have to be ready for some aggressive local driving styles on the highways. They require an International Driving Permit for Americans, which you just pick up at AAA before leaving the states. You also need to verify the vehicle has a valid vignette, which is a digital toll pass for the national roads. The police pull foreigners over just to check those documents quite often. The agencies usually put a hefty hold on a credit card for the deposit, so double check that your limit can handle it.