Take the direct route along Tullastraße and Berliner Straße to the banks of the Neckar and follow the river heading towards Heidelberg as far as Neuostheim Airport. The bus stop in front of the airport is your turning point. You may wish to put in a break for refreshments in the airport building. At this point, you cross paths with the original route of the Mannheim Marathon. After turning, follow the same route back to the hotel.