Ushuaia, an exotic name for a remote little city. You are at Tierra del Fuego, the most southern part of South-America. You may still see a few animals, but mostly it is wild, windy and abandoned. The Panamerican Highway that starts in Alaska ends here... Boat expeditions to the Antarctic may depart here.
Buenos Aires is known as the "Paris of the South". It has beautiful allees, great shopping and of course the Tango in the colorfull city part "La Boca"! Note that Buenos Aires is different from the rest of Argentina.
Mendoza is a nice, modern city at the foot of the Andes. It has many vineyards and bodegas. Feel free to taste and enjoy the sites. From Mendoza you can also cross to Chile passing the Aconcagua mountain.
Bariloche is known as "little Switzerland". Heidi does not live here nor is there a Matterhorn, but there is lots of Chocolate and great scenery. The lakes could indeed be Lucerne, but less crowded...
Cafayate is an important tourist location in Northern Argentina thanks to the extraordinary landscape and the great wines. The largest golf course in S-America is here.
A personal favorite. Nice "little" city with flowers and churches in an arid environment "away from it all".
Puerto Madryn is a coastal city in Patagonia. It is well-known for the nearby Peninsula with a lot of "wild" life, if you can call all those Penguins and Sea Elephants "wild"... You may also have a real opportunity to see Orcas here.
The Perito Moreno near Calafate is a gigantic glacier in the far south of Argentina. Unlike most glaciers this one is still growing. When big chunks of ice break of the head of the glacier into the lake, it is a great sound, something you won´t forget.