The town of Posadas faces its Paraguayan neighbour, Encarnación. across the Rio Parana. In the summer the heat is suffocating and a healthy nap is recommended. Even the children go to school very early in the morning in order to be able to do other things in the afternoon. And preferably in the shade!
I went to Posadas to spend a weekend with a friend from Misiones. I have to say that the town is not particularly charming but the friendliness of its inhabitants more than makes up for that. During my stay I went swimming a lot in the Rio Parana. If I wanted a little walk I went to la costanera (the promenade) or the Paseo de la Estación de Trenes. In the evening Posadas' young people go to Avá, the "in" bar.
Posadas is somewhere to go for a weekend or to visit a friend. However, the Iguazu waterfalls are only a 3 hour drive away, as is Los Esteros del Ibera, and the ruins of the Jesuit mission at San Ignacio are only 30 minutes away.
Posadas is a pretty big city, and it comes to life at night. It must be said that the heat is persistent and everyone takes their storied siesta between noon and 4:00 pm, to get the most out of their evening. It's an atmosphere that could be described as "Spanish", which should be inspiring to anyone who loves having cocktails on the terrace!
It should also be noted that Misiones is the poorest province in the country, so needless to say, you run the risk of witnessing some awful inequalities when you're in the area. The town is the departure point to the famous Argentinian missions, the ruins of a tragic past, yet in a magnificent tropical setting. San Ignacio is the one that seemed the prettiest to me, although it's also the most touristy. If you don't have a lot of time during your trip to Argentina, choose this one!
My favourite, on the way to Puerto Iguazú and its famous waterfalls: the Wanda Mines where amethysts and other types of quartz are mined. The deposits are wonderful!
For those on a more "liberal" budget, Posadas is also the departure point to the famous Iberá Nature Reserve (which I didn't get the chance to visit).