Connect with your spiritual side and meet other worshippers at Santo Domingo Church. Explore outside for a while or ask if you are allowed to join the next service.
You'll soon see why this Sucre house of prayer is visited by many travelers. If you're searching for other things to see here, Plaza 25 de Mayo, Sucre Central Market, and Sucre Cathedral are in the area too. They won't take very long to reach from Santo Domingo Church.