As La Cornouaille is a part of Brittany with Quimper as its capital (also known as la Cornouaille bretonne), Cornwall is normally known in France as Les Cornouailles to distinguish them from each other.
if you say: "Je vais en Cornouialles pour mes vacances cet été" , it might sound ambiguous but with the context it would be clear , I think.
Hope this helps!
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