Traffic-free touring in France or Spain

I'm keen to do a few days/maybe up to a week of touring in France or Spain next summer. I'd like a scenic route that also incorporates as much traffic-free riding as possible (and no or next to no fast busy roads). I'm looking to get away from roads entirely, not ride alongside them - but at the same time not I'm not keen on full off-road heavy-duty mountain biking trails; what I need is something along the lines of the Routes Vertes/converted old train tracks/canal paths etc), but over a fairly long distance. Does anyone know of any good routes or resources dedicated to this? This would be my first tour so I'd also be looking for a route that isn't very arduous.
Thanks in advance.
Thanks in advance.
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You could do a circular route from Strasboug to Colmar and back. Easyjet fly to Strasboug.
http://www.cyclinginalsace.com/en/cycle-trails/waterways-and-vineyard-cycle-routes.html
Gives lots of route suggestions using voies vertes. For example, there's a good circular 143km route between Chalon and Macon in south Burgundy, much of it on converted former railway line and riverside trail. I rode some of it this summer. It's an attractive area with plenty of interesting towns and places to visit.
The site's home page has plenty of other suggestions all over France. As mentioned above, Alsace has plenty of traffic-free routes through beautiful vineyards and flower-filled villages.