Who says they're American dollars!!? [haha] [big grin] [blah]
Dollar is the name of more than twenty currencies including (by population) those of the United States, Canada, Australia, Taiwan, Hong Kong, Singapore, New Zealand, Liberia, Jamaica and Namibia. The U.S. dollar is the official currency of East Timor, Ecuador, El Salvador but Saint Lucia, Dominica and Saint Vincent and the Grenadines each use the East Caribbean dollar. Bahamas uses the Bahamian, Barbados the Barbadian dollar and quite a few other countries have their own version, that are distinctly not $ US.
I like the idea of Planko's (Plankonian Dollar?) but until that's official my parks all use Bermudan bucks, If only because they match my avatar's shorts which believe me, are even louder than his Hawaiian, shirt. (Or Peso's)