Blois is incredibly flat and arable, so doesn’t look like much potential.
We were a bit further west, near Bourgiel (about half way between Tours and Saumur) and actually found a whole pile of waymarked riding. The secret is to keep an eye out for the FCC VTT markers – they look like this:
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Wed 5 – MTB Loire[/url] by Stu_N[/url], on Flickr
You then need to find yourself a map; most of the villages the routes pass through will have a board somewhere and the Tourist Office in the nearest reasonable sized town will usually have paper maps. The waymarking is a bit vague in places, particularly where routes join or overlap so definitely sort out some sort of map (the first day we worked from an IGN map and a photo of the map board). We ended up doing a 70k route that was almost entirely offroad from Gizeaux down to Bourgueil and back through the forest and vines. Was mostly forest double track – but way better than expected; only had MTBs as we were going to the Alps the following week. If you go back and forward from the marker pic you’ll get an idea.
There’s a whole network of FCC centres in France – they seem a bit variable from full-on MTB in ski areas to a few waymarked routes on forest roads – so you may get lucky. We did have a map with various routes in the department around Tours (Indre-et-Loire) but I can’t find it, guess didn’t bring it home.