You can take anything on there, and it takes the tank of gas and something ridiculous cheap like 10 Euro. Didn't rent anything, but in the back stage, they had easily 6 R8s sitting there, ready to rent and drive. I we for the back stage tour, which was really interesting; even if they don't speak that much English.
There's a diner up right before the castle, there was enough to fill me, so check that out. And go up to the castle, get up to the highest point, and enjoy.