I agree that it is best to see the incredible Iguazu Falls from both sides of the border if you possibly can. The Argentine side gives you the chance to get up close to the falls, and the national park is so beautiful. The Brazilian side gives a better overview of the falls, and you realise just how huge an area they cover. Get there early - whichever side you're on - to beat the crowds, and especially on the Brazilian side where there is a bizarre queuing and bus system that means it can take a couple of hours to get from the gates into the park. Well worth it though.
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