Ferry routes to France - advice please

I am thinking of doing some riding in the Pas de Calais, but am unsure whether I would be better off taking the bike by car or on its own by ferry. Does anyone have any advice as to the best route to take, etc?
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Hotels in France are really cheap and the riding is pure pleasure. Save the cost (and hassle) of taking the car and treat yourself to some nice meals.
Fast and Bulbous
Peregrinations
Eddingtons: 80 (Metric); 60 (Imperial)
In Calais, look for the sign "Centre Ville" after French Customs. It's a slip road that takes you to a roundabout.
Turn right at the roundabout and across a little harbour bridge to get to Calais town centre and quieter roads to Les Deux Caps.
Go straight on at the roundabout and take the second proper left to reach a little bridge over the motorway to reach a network of really quiet lanes to go up towards Belgium via Gravelines. Pretty countryside, lots of birds.
http://www.crazyguyonabike.com/doc/?o=3 ... =3244&v=5K