Get in touch with your spiritual side and mingle with worshippers at Notre-Dame la Grande. Sit in quiet reflection outside for a few moments or ask if you are allowed to join the next service.
You'll be spoiled for sightseeing choice when staying in Poitiers. Notre-Dame la Grande is a great place to start here, but there are lots of other worthwhile attractions to experience. Futuroscope, University of Poitiers, and Poitiers Cathedral are not far from the house of prayer and will round out your day nicely.