Traffic free cycle routes in France.

I plan to visit the Camargue next April/May and the route is straightforward.  Can anyone recommend sites on the way that have close proximity to some traffic free cycle routes?

We will take toll free roads, a week there and a week back, 4/5 nights on site somewhere in the Camargue

We like to drive during the morning, 3 to 4 hours and spend the afternoon looking around the area of the campsite.

I will be calling into Remuzat for a couple of nights to view the birdlife, spent 20 minutes there on a birding holiday.  Not enough time.......

 I normally start serious planning Jan 1st, but it's raining and I need something to lift the spirits.