Altes Friedhof is a vital piece of the area's history. Keep an eye out for any epitaphs which often provide a bounty of interesting facts.
You'll have no end of sightseeing choices when visiting Kelheim. Altes Friedhof is a great place to start here, but there are plenty of other worthwhile places to experience. Weltenburg Abbey, Danube Gorge, and Befreiungshalle are near the burial ground and and will cap off your day nicely.