The town of Bayreuth itself is small & has many well-preserved Baroque buildings...
...thanks to the 18th century patronage of Markgräfin Wilhelmine.
You can see everything & more in a walk of a couple of hours.
For Wagner pilgrims a must-see is Haus Wahnfried, the Wagner family home on the edge of the city center. It's currently undergoing a major renovation that will surround it with a Wagner museum complex. There is no direct access this summer, but it is still open.
Wagner's grave is behind the house & has easy access, though.
Wagner's dog Russ is buried there too.
The Hofgarten which runs behind the house is tranquil & a good place for quiet walks between performances.