We're not sure yet, we have a ferry booked for early June, and will decide what route we fancy whilst on the ferry, we'll then just 'set off south'. We'll stay the first night somewhere near where-ever we end up when we're tired of driving, and buy a newspaper. We'll look at where the weather is - and head in the direction of the sun. This may take us down to Spain, or over to Italy! If it's good weather where-ever we are on the first night we may stay there! We set off one year for Italy and discovered the whole of northern Italy had ferocious thunderstorms, so we turned 'right' and went to Spain instead, staying on the Costa Brave for ten days, then back through France - fantastic weather all the way.
One year we stopped 'overnight' in the Ardeche, and ended up staying for two weeks. That's the beauty of caravanning in early season in France - go as you please and follow the sun. You couldn't do that here - so we've booked for Easter in Abersoch!
However, this might be changed because we're thinking of buying somewhere in France - so we may just spend some time house hunting during the holiday.