The campsite the Safrière is situated between the Crotoy and Saint Valery sur Somme.
You can go to Le Crotoy or Saint Valery sur Somme by bike by taking the small tourist train which is 1 km walk out of the campsite.
(Possibility of putting your bike on the train).
For the bravest, you can go to Le Crotoy on foot in 45 minutes.