Most of Cozumel's banks are in the main square and are open weekdays between 9 and 4 or 5. Many change currency all day. Most have ATMs that dispense pesos, although dollars are available at some ATMs near the cruise-ship piers. The American Express exchange office is open weekdays 9 to 5. After hours, you can change money at Promotora Cambiaria del Centro, which is open Monday through Saturday 8 AM to 9 PM.
Bancomer (Av. 5 Norte at plaza. 987/872-0550). Banco Serfín (Calle 3 Sur and Av. 10 Sur. 987/872-2853).
American Express (Punta Langosta, Av. Rafael E. Melgar 599. 987/869-1389). Promotora Cambiaria del Centro (Av. 5 Sur between Calles 1 Sur and Adolfo Rosado Salas. No phone).