Originally Posted by
greggarious
Nowhere in the world (except some Carribean countries and a few touristy border towns in Canada like Niagara Falls) can you use USD, and there's usually not a good exchange rate.
Ecuador uses USD bills and coins as their daily currency (in case anyone's been wondering where all those gold dollar coins from the mint ended up).
I've also gotten US notes out of ATMs (and used them exclusively to pay for hotels and tours) in Cambodia and Peru.