Hot, hotter, Oberer Letten: In this river pool, chiselled bodies sun themselves on trendy bathing towels or let themselves drift in the 1,312-foot-long swimming canal. There's a women’s-only area, and the on-site Panama Bar offers tapas, paella, fish from the grill and refreshing drinks – a popular location for after-work cocktails. For the more athletically inclined, there are beach volleyball courts and a space for skateboarding across from the pool.