A must-do for all ages, the Bird Park (Parque das Aves) in Foz do Iguaçu is a unique experience. You can see the birds at close quarters, or better yet, get in the huge aviaries and let them come near you.
In northern El Calafate you find Laguna Nimez; the city on one side and Lago Argentino on the other. What you can do fun here is take pictures, ride a bike, go horseback riding and go for a walk. You can go around the lagoon and along the lake.
In the hottest months of the year, Isla Martillo is the home of 2 species of penguins, Papúa and Magallánico. They come to reproduce, and the youngest ones to change their plumage. These young penguins are rather ugly and have missing feathers. The island is full of nests, which are holes in the sand surrounded by plants. I had never thought I could see so many penguins on a landscape like this.