Maybe you have come for a tour along the Rheinsteig long-distance hiking trail. You start at Bonn, market place, you cross Kennedy bridge to the right bank, and then the Siebengebirge is one of your first stages.
The Rheinsteig sign posts show an “R” on a blue background.
If you see an “R” on an ochre-yellow background, you’re on an access route. From the Siebengebirge the Rheinsteig continues all along the right bank to Wiesbaden.
For further information in German and English: www.rheinsteig.de