Of all the things I've done while visiting Argentina, I think this stands out as the highlight -- meeting penguins face-to-face (or rather, face-to-beak), in their natural environment.
They're curious and amusing creatures. Some don't pay any attention to you, but others are certainly checking you out, trying to figure out who you are, and what you're doing on their island.
These are some of the highlights of my trip to Martillo Island, in the spectacular setting of Tierra del Fuego.