... that St-Pierre and Miquelon (south of Newfoundland) is French, and therefor will also be using the Euro as their currency. The islands represent the sole remaining vestige of France's once vast North American possessions.

In addition to the FWI Martinique and Guadeloupe, I found other French West Indies islands where the Euro will be used in the Caribbean:

Les Saintes
Marie-Galante
Iles des Gantes
St-Barthelemy
St-Martin

JB