Satisfy the culture vulture within at Richard Wagner Museum. Check if there are any guided tours or ask a museum employee to direct you to some of the highlights.
You'll have sightseeing choices galore in Pirna. Richard Wagner Museum is a good place to begin here, but there are many other interesting attractions to appreciate. Pillnitz Castle and Park, Blue Wonder Bridge, and Dresden Elbe Valley are not far from the museum and will fill in your day nicely.