I did a nice mini-tour around Nord-Pas de Calais and Belgium a couple of years ago that involved cycling down the Calais to St Omer canal and bimbling around almost traffic-free back roads. I threw in a couple of hills for variety but you can avoid them. Great beer and food at the Estaminets dotted about all over the place too. Can try and dig out the route if you like.
I did a nice mini-tour around Nord-Pas de Calais and Belgium a couple of years ago that involved cycling down the Calais to St Omer canal and bimbling around almost traffic-free back roads. I threw in a couple of hills for variety but you can avoid them. Great beer and food at the Estaminets dotted about all over the place too. Can try and dig out the route if you like.