All the sites for the vast majority of tourists going to Figueres are easily reached on foot, and there are plenty of benches and public spaces for a rest in the shade if one gets tired while walking around.
For those looking to travel outside of Figueres to smaller, historic towns, castles, restaurants, or wineries, there are several car rental offices Europcar, Enterprise, Avis right next to the train station, although it is highly advisable to book ahead online to get better rates than just showing up.
