Will I be able to use ATM's with an American credit card?

ATM's in Curaçao (recognizable by the "Bankomatiko" sign) accept major credit cards as well as debit cards. For the latter they use the Maestro, Cirrus, and Cashnet systems; if you plan to use your debit card, make sure your card has at least one of their symbols on it. You can withdraw either US Dollars or Antillean Guilders from ATMs in Curaçao.

If you plan to use your credit or debit card during your stay, be sure to inform your bank that you'll be using your card abroad, including the dates you'll be traveling.