If you want to enjoy the sea air in Pornichet, go to one of the 3 sandy beaches: Bonne Source, Sainte-Marguerite or the Plage des Libraires which extends the Grande Plage. It is on the latter, the Plage des Libraires that you will find your happiness: a restaurant with a private beach for a privileged moment of relaxation overlooking the sea.
And when the temperature is good enough why not eat directly with your feet in the sand or reserve a deckchair for a tanning session ?