The Piste des Forts, or fortress cycle trail, covers 85 km in France and Germany and takes you round the 19 fortresses of the "Fortress Belt." I will take you on a bike tour that covers parts of the trail (20-30 km as per your wishes) in both countries. You will see beautiful scenery and enjoy the fresh air of the countryside in your lungs.
I regularly bike on this trail and would be very happy to take you along. If you don't have a bike with you, you can use a Vélhop-bike which is part of the bike sharing system in Strasbourg.
About Gilles - the Doer
I love cycling and the diverse roads of Alsace. I often bike with my wife and children, but they are not as passionate about it as I am and it would be great to share my knowledge of local cycling trails with other people.