Brittany is excellent for walkers and cyclists, the grande randonée (GR) 37 passes right by, there is also the Nantes Brest Canal for those who prefer their route to be level.

http://www.gr-infos.com

http://www.brittanytourism.com/page/p-226/art_id-443/html-explore-inland-brittany-the-nantes-to-brest-canal.html