If you're after somewhere peaceful to spend some time, make your way to Basilica of Saint Eulalia. This house of prayer offers a welcome respite from a busy travel schedule.
You're spoiled for sightseeing choice when spending time in Merida Old Town. Basilica of Saint Eulalia is a good place to start here, but there are loads of other fine spots to appreciate. Roman Theatre, Temple of Diana, and Plaza de Espana are not far from the house of prayer and will fill in your day nicely.