Centre aquatique Iléo is the main waterpark and aquatic centre at the entrance to Ile d'Oleron. It has slides, a wave pool, water-play areas, a surfing area and indoor pools, making it a useful poor-weather or family-focused alternative to the island's beaches.
It is not a cultural sight, but it earns its place as a practical visitor stop for families staying on the island. Check seasonal hours before going, as the outdoor attractions are most useful in warm weather.