You will need enough spending money for an evening ashore (shopping, drinks, souvenirs), and for the crew gratuity (15% is customary). The local currency is the Bahamian dollar, which is equivalent to the U.S. dollar and are interchangeable. If you have U.S. dollars it is not necessary to exchange currency. You can charge your specialty classes and crew gratuity to your cabin account. Cat Ppalu accepts VISA, MasterCard and Discover.