Barcelona is about 100 km from Sant Feliu and is easy to drive to for a day of culture.
A visit to La Sagrada Familia, by the famous architect Gaudi, should not be missed when you visit Barcelona.
Take a walk and relax in Park Güell. Ordering tickets in advance for most sights saves a lot of waiting in the summer.
You can also enjoy delicious tapas in the many tapas bars in the narrow streets.