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'''Option 1'''

On the motorway ring around Cologne, to the west of the city, there's the motorway service area Autobahnparkplatz Frechen Ri. AK Kerpen. You can reach it by catching a train to Frechen-Königsdorf (around 20 minutes). Turn right on the stairs at the station, walk through the car park, turn left on Augustinus Straße, walk straight for 2 minutes and then turn right on to Marienhöfer Weg. Keep walking up this path into the forest for 5 minutes. Eventually you will come to a crossroad with the service station on the left.