Take in the grandeur of Almeria Cathedral. Stay for a service if you can or simply wander around and appreciate the peace and quiet.
You'll be spoiled for sightseeing choice when in Almería Centro. Almeria Cathedral is a good place to kick off here, but there are lots of other worthy sights to explore. Alcazaba, Puerta de Purchena Square, and Playa de Costacabana are close to the principal church and will round out your day nicely.