I left Florianopolis for a few days to go to Foz do Iguacu. Argentina and Brazil are divided by the Iguacu River, and at one point the water plunges into a spectacular set of waterfalls. Most of the falls are on the Argentine side, so the views from Brazil are panoramic, while the views from Argentina are up-close.
I visited both sides. The water is at a seven-year high, so a few trails on the Argentina side were closed. Of course, the falls were spectacular on both. This photo is of the view from the Brazilian side.