This year in the June/July holidays, me and my family went to Iguacu National Park. I didn't realise that it would be so spectacular! Like Anne-Sophie Bertrand, I recommend seeing the Devil's Throat and also going on a boat-ride under the falls!!! You really don't know what your missing if you don't see the Falls in your lifetime!
It was sooooo much fun and I hope that you guys will visit there sometime soon, also! :)