Karlshöhe is one of Stuttgart's easiest rewards: a former quarry turned park, high enough to give a broad view over the city's southern basin without requiring a serious hike. The paths, lawns, and terraces make it a useful green break from the denser streets below.
Come for late-afternoon light, when the roofs and vineyard edges around Stuttgart start to make sense from above. In good weather the beer garden gives the hill a social edge, but the viewpoint remains worthwhile even if you only climb up for a short look and a quiet walk.