Touring to the Ardeche-all advice greatly received

Hi all! We are a young family taking our caravan to France for the first time! We've set our hearts on going to the South Ardeche region (around Montelimar) but I'm being a tad on the cautious side - much to my husbands disapproval! Any advice anyone can give about travelling there, including recommended sites on the way down from Calais, would be very greatly received!

many thanks in advance!

The Jones family