On 2 occasions I piled into too small of a car with some school/uni friends for a 12 hour road trip to a campground on the mediterannian sea. Once in Apulia, once on the Costa Brava near Barcelona. Planning was minimal & we were all a bit desperate and drank too much. Still the greatest I ever remember feeling on vacation.
We made a day-trip to Barcelona of course. After we got our time-slotted tickets for the Sagrada Familia we had some time to kill, so wandered into a tapas place a block away. We were a large enough group to order the Paella and it was amazing.