I have been given the chance to live within the park boundaries for two months and to work there as a wildlife biologist. It was just the most intense place I have ever been in. There is so much energy once you get down into the Devil's Throat (which is the name of the main water fall). If you get the chance to go there, don't miss the chance to do some rafting in the IguaƧu River and enjoy the trails around it.
But, remember : these waterfall are one of this world's wonders, they are to be respected (so...As your mom would remind you : put trash in garbages, don't feed the animals (even though they will look very friendly to you and to your granola bar...) and keep on trails). Thanks for them!
Now, you are all set to experience one of your most unforgettable nature trip ! Have fun