Take in the grandeur of Valence Cathedral. Schedule in a service if you can or simply wander around and enjoy the serenity.
You'll be spoiled for sightseeing choice when spending time in Valence. Valence Cathedral is a great place to kick off here, but there are lots of other worthy sights to check out. Maison des Tetes, Chateau de Crussol, and Chanalets Golf Club are near the principal church and and will cap off your day nicely.