Its funny how different people see different things- I have been meaning to make a trip to Rosario for some time, specifically because of the architecture- it has a lot of really good Art Noveau, and Art Deco buildings. And the Parque de la Independencia was designed by the great landscape architect Carlos Thays- I am always up to see his projects.
The architecture school there is quite well regarded, and its easier for a young architect to get jobs there designing new houses, so the more modern stuff is interesting to me too.
I was once on a flight from BA to Dallas with Gerardo Caballero, who teaches there and practices as well, and I would love to see some of his buildings, including the Edificio Guemes, and a groovy bicycle store he designed.