Connect with your spiritual side and mingle with worshippers at Church of St Peter the Apostle. Quietly reflect outside for a while or ask if you are allowed to join the next service.
When you've spent a bit of time at this house of prayer in San Felices, why not check out Church of St Nicholas of Bari, and Church of Aguilar del Rio Alhama? They're near Church of St Peter the Apostle and also popular with many tourists.