Fuerte San Miguel is a compact stone fortress west of Chuy, inside San Miguel National Park. It is smaller than the better-known Fortaleza de Santa Teresa, but the setting is quieter and the border history feels more immediate. Thick walls, bastions, and a simple military museum give the place enough substance for a worthwhile stop.
The fort sits on Cerro San Miguel, surrounded by grassland, palms, and low hills rather than beach resort sprawl. It combines well with Chuy, Barra del Chuy, or Santa Teresa in a day by car. Public transport is possible but limited, so check return times before you set out.