Whether you'd like to say a few prayers or learn about the building's history, Chiesa di San Nicola is a worthwhile site to visit. Check to see if this sacred place is publicly accessible to experience the peace it offers inside.
You're spoiled for sightseeing choice when in Agrigento. Chiesa di San Nicola is a great place to begin here, but there are plenty of other fine sights to visit. Valley of the Temples, San Leone Beach, and Scala dei Turchi Beach are close to the house of prayer and will round out your day nicely.