These waterfalls are utterly amazing - and if you are going to be anywhere within a couple of hours flying time of Iguazu airport it is definitely a trip that is worth making. Of course, there are scores of really rather comfortable long-distance coaches that also go to Iguazu.
We would strongly recommend (as had been suggested to us by John Fernandes the brilliant host of an excellent small B&B in Puerto Iguazu "The Secret Garden") that you see the Falls from the Brazilian side of the river first; this gives you a slowly unfolding vista of the Falls (80% of which are on the Argentinian side of the river) and the unbelievable picture postcard just gets larger and bigger and wider.
Then later see and experience the Falls from right up close on the Argentinian side of the river. An extraordinary visceral experience. No natural phenomenon anywhere has in any way matched the power and beauty of the Falls.
It's probably best to try to go at towards the end of the day when there will be far fewer people - and, ideally out of the height of the tourist season. October was ideal: neither too hot nor too humid - perfect spring weather.
Remember that dengue fever has re-appeared in the region and use lots of serious insect repellent.
And you will almost certainly get very wet (even if you do not take the boat into/under the Falls) so think about waterproof protection for cameras etc.
On the Brazilian side there is also a good bird park; while on the Argentinian side there are several great walks through the semi-tropical forest.

en.wikipedia.org/wiki/Iguazu_Falls

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