Bus 7 runs up to the border (frontera) every 10 minutes or so from Plaza de la Constitution (€1). If you arrive by ferry and want to head straight for the border, there’s a bus stop on Ave González Tablaz opposite the entrance to the ramparts. Local buses also stop on Ave González Tablaz. There’s also a taxi rank outside the terminal building.
If you have your own vehicle, street parking is restricted to a maximum of two hours (€1) during the day. If you are staying longer, use the car park on Calle O’Donnell.