TheFork users who ate in Cernay-la-Ville have said really good things about La Ferme de Voisins, Auberge du Manet and Bistro Birdie. Maybe you should give them a try!
Some of the more popular Seminar restaurants having a terrace in Cernay-la-Ville according to TheFork users include:
La Chalosse, with a 9.4 rating
Les Terrasses de Clairefontaine, with a 9.5 rating
La Fontaine, with a 9.2 rating