Connect with your spiritual side and meet other worshippers at Holy Trinity Church. Quietly reflect outside for a while or ask if you're allowed to join the next service.
You'll soon see why this St. Andrews house of prayer is a hit with travelers. If you're searching for other things to see here, University of St. Andrews, Old Course at St Andrews, and St. Andrews Links are in the area as well. They won't take you long to reach from Holy Trinity Church.