There aren't any banks in Cilaos, but you'll find two ATMs, one at the post office and another ATM in the street leading to the small covered market.
Post Office Has an ATM that accepts Visa and MasterCard, but don't rely on it completely: it occasionally runs out of euros, especially on weekends.
Tourist Office The tourist office is particularly helpful, with multilingual staff who provide reliable information about local and long-distance walks and dispense lists of accommodation, restaurants and activities. The office has pamphlets on bus schedules in the Cirque and sells walking maps. You can also book gîtes de montagne here. Also has free wi-fi and sells handicrafts.