My quest for a beach

Friends, did you know there is a beach bar in Wuppertal?  Well the  internet tells me there is, but I can't find it. It is close to the historical city hall, but I just can't find it. Even with my fancy phone and GPS -- I can't seem to find the blasted place. And the summer is almost over. Soon the couple of days we have had of sun will be gone and the cold and rain will be back.