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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It is the most amazing natural wonder of the world you will ever see in your life. My jaw still hasn't come up from dropping. It is amazing. The nature, the power of the water, the wildlife, the adventure of being so close to something so great. there are cheap flights from BA: www.bsas4u.com/bsas-iguazu-internal-flight-p-160.html
I'm serious, you have got to see this.

www.BsAs4u.com
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info@bsas4u.com

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These falls are simply magnificent. Bigger and better than either the Virginia or Niagara falls apparently. They can be easily visited from either the Brazilian or Argentinian side by public transport. The Brazilian side was my favourite as you get views of the whole of the falls.

The Argentinian side gives you a more up-close-and-personal view but not one of the grandeur of them. If you have time go to both sides.

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