Dechsendorfer Weiher is Erlangen's practical summer lake, a place for swimming, walking, cycling, and lazy afternoons away from the old town. It is not dramatic scenery, but it is exactly the sort of local landscape that matters when the weather is warm.
For travellers, the lake is best if you are staying more than a day or visiting with children. Bring a picnic, check bathing conditions in season, and treat it as a low-key look at how Erlangen relaxes rather than a must-see monument.