If you'd love to add some extra culture to your vacation, put Stadtmuseum on your to-do list. Check if guided tours are available or just look around in your own time.
You're spoiled for sightseeing choice when visiting St. Pölten. Stadtmuseum is a great place to kick off here, but there are lots of other interesting attractions to visit. St. Polten Cathedral, Domplatz, and Sankt Polten City Hall are close to the museum and will top off your day nicely.