Marvel at the size of Duitama Cathedral. Stay for a mass if you can or just wander around and appreciate the serenity.
You'll have no end of sightseeing choices in Duitama. Duitama Cathedral is a great place to kick off here, but there are numerous other worthy sights to visit. Pueblito Boyacense, Plaza De Los Libertadores, and Innovo Plaza Duitama are near the principal church and will fill in your day nicely.