The Argentinean side of Iguazu falls is a much larger place, you can easily spend an entire day here, as opposed to the Brazilian side where you can walk the trail in a couple of hours. There is a trail through the jungle where you can walk to a small waterfall which you can swim in. We walked it in the morning before we visited the maim falls, its quiet, peaceful and very pretty walk. We saw lots of coatis, many different birds as well as a troupe of cappuccino monkeys sitting in the path, they let us get really close to take pictures.
After a chilled out walk we spent the afternoon seeing the main attraction – Iguazu falls. There are several trails of different lengths and a small train to take you between the main entrance and the trails. We managed to walk all the trails, getting to see the falls from many different angles. Because there are several trails people spread out and it feels a lot less busy than the Brazilian side, when sitting watching the falls we even managed to hear, and spot a toucan. You don’t get quite as close in the falls, although there are still several points you can feel the power of the water, including the main attraction, devils throat, where you can stand above a massive rush of water, but I did feel like you can appreciate the falls better. I also liked that they put covers on the bins, stopping the coatis getting into them, this and other measures meant they were a lot less aggressive on this side and seemed to stay more in the jungle and their natural environment. I’m glad we visited both sides of the falls as they are very different but if I had to chose only one I’d go to the Argentinean side.