Camping La Ferme Des Saules is a lovely site.
Liked: I stayed overnight on the way into France and on the way back. It was not the closest to Calais, about one hour travel, but very comfortable and quiet with a friendly, helpful English speaking host
Could be better: For a longer stay I would have been looking for a cafe for light meals within 10 minutes walk and even overnight it would have been useful to be able to get coffee on site without setting up hook up power for a kettle.
Pitch + tent