morewierd: Thank you for your mini trip report! I forgot to ask about the Chevallier bus. But, you answered that question, too. :)

We are planning a trip to Rosario with a porteña friend. Also, we are going take a boat tour on the river through the island while we are there as my DH is an avid birder. The website below mentions boat tours as well as many other things to do. It has a pretty good restaurant guide, too. But, it did not list any hotels. Any hotel or restaurant recommendations?

http://argentinastravel.com