In reply to hcaw:
so for the route I've planned the following:
Set off from Orange North-west along south border of Ardeche
South-west through Cevennes National Park
Continue south-west through Parc Naturel Regional des Grand-Causses
South to coast?, pick up the canal du Midi at some point to Toulouse?
It's very general at the moment and I'm still unsure of specifics, especially after leaving Grand-Causses. I want to pick up the Canal-du-Mid but I've heard it's a bit boring.
Does anyone have any route suggestions?