The Brazilian side of the waterfalls can easily be visited from the town of Foz do Iguacu. A bus takes you through the park, which is a bit too touristy for me (but maybe it has become necessary because of the number of visitors).
There's a lot of (manmade things) to see and to do here, but I came only for one: to see the falls in all their glory. And fortunately, that's still possible. From a distance of one or two km (?) you get an overview of the number of falls that together form a big and broad front.
A bit further on, you can get closer and let yourself get wet. Many rainbows colourize the falling water, lovely to see. The butterflies here are also great to watch.