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Dunkirk is pretty bleak. The port isn't that close to the town proper, the roads are busy with lorries and there's no scenery to speak of. Belgian coast is ok, especially as you won't be going in the height of summer. I saw a few people camping along the Bruges-Ghent canal, and planned to do so myself, but stuff happened, so. It would be ok for one night, I think. But you could easily do Dunkirk - Ghent in a day, and stay there overnight. Ghent is lovely.
That Calais - Ghent trip upthread is kind of similar to a ride I'm planning in the next few months - I'm looking at going Dunkirk to Rotterdam.
Does anyone have much experience of riding in the area - specifically, trying to decide whether to wild camp / bivvy roughly half way (near Bruges I suppose, but obv not in the city), is it going to be nice countryside with plentiful spots or does the flatness mean exposed and not that pleasant nights? Alternatively, any recommendations for accommodation around the same area - not fussed about big or small town, it's all a bit loosely planned at the mo.