Favorite thing: A funny phenomenon to observe... when the tide goes in, water seems to push forward a bundle of foam, that totters its way through the bay :-) The picture unfortunately doesn't completely reflect the "ploup ploup" of the foam :-)
You must be careful though, because the sea is faster than you may think... it often happens that people are suddenly surrounded by water, isolated on little islets of sand, because the tide goes in from different sides.
Favorite thing: The grasswort, or salicorne in French, is a typical plant of salt marshes or beaches which is very common in the Baie de Somme. They have the time to develop when the bay is emptying and are then totally recovered by the sea at high tide.
At the end of the summer, the plant dries and looks like a little squeletton... the young sprouts will only start to grow in the Spring.
It is also called Corne de Sel in French (Horn of salt) because of its branches that end with a sort of little bulb...hence the name Salicorne.
The grasswort is also a very good vegetable that can be eaten along with meat or in a soup. It is even used to flavour mustard, mayonnaise, or vinegar.