We arrive in Calais at midday and will be heading to Rouen. Is there anywhere interesting to stop on the way? We are a family with 4 children aged 3-11.
Thanks

It's 150 miles, a motorway all the way and will take you just 2 hours.

There's tons of stuff of some interest along the way - but any sidetrip (such as to Boulogne) will take about as long, and few of the most-visited London suburbs en route (like Wimereux, Le Touquet or Montreux) are likely to appeal much to children anyway.

If you've had a long car journey before Calais and the children are screaming to let off energy, stop at the Baie de Somme service station between J23 and 24 of the A16, where there';s a huge expanse of wetland they can run round in. Or turn off just before Boulogne for Wimereux, where the beach is quite close to the motorway (though parking is sometimes a bit tricky) and let them loose there.

You do pass quite close to Agincourt, Crecy and the site of the Field of the Cloth of Gold, though I've yet to find any of these generate much interest.

There's a quirky set of French resort-like places south of the Etaples turnoff (about 40 miles S of Calais) The Bagatelle theme park is France's oldest, and underwhelmed me 50 years ago, but has probably added a few attractions since.

Personally, I'd drive straight to wherever you want to get to, then start diverting them there.

Thanks for your advice lots of possibilities there, but I think maybe a couple of hours in le touquet might be nice and not too far off track. Rouen is our first stopover, so maybe a couple of hours the in the evening before sleep.

Thanks again