I agree Ed, to a degree. But, sometimes in the past certain restaurants on the french side carried a dollor-to-euro exchange rate that was more favorable for paying with euros. Of course, you could simply use a credit card as long as your credit card did not apply a foreign exchange fee. One dining experience that I can recall our dinner bill was something like 90 euros, but when I paid in USD it came to $106 as I recall. At that rate they were only giving .85 euros for each U.S. dollar and the fair rate was roughly .91. So the U.S. currency conversion should have bee approximately $99. It was a small amount that almost isn't worth mentioning, but over time if every restaurant on French St. Martin did this it would add up.

Today, with the dollar/euro exchange rate trending the dollar upward, it may be a smart move to have some euros on you if you dine at a place where this situation exists. The thing to watch for is any place that really 'jacks up' the exchange rate beyond logical limits, so always wise to ask before you dine.