Georgia is correct, there are ATMS which will dispense Euros on the French side, but you don't need them. I don't think we've EVER used Euros. Back in the day, we used to get some French francs for some reason, don't remember why now. Dollars are accepted everywhere, on BOTH sides of the island, even though the Dutch side technically is guilders. Guilders are specifically tagged to the dollar, so the exchange rate does not fluctuate on that at all. If you happen to see a price in Guilders, an easy way to compute the price is to divide in 2 and add 10%.