We took a private tour that the hotel prepared. We were 20 people so we had a small bus. It was the best way because we got to go where we wanted to, stop at the local (and famous) marketplace and eat inside at a seafood place, much like a food court. We traveled the whole city at our leisure and the tour guide took us to the most important places and we got down to take pictures.
It was very interesting. A beautiful park for nature lovers. Previously on another cruise, we had taken the tour "Train at the End of the World" so we didn't want to repeat the same one. That one was actually better in comparison because you also see part of the park and the old red train was kind of fun.
Actually it was Punta del Este, Uruguay, which is a beach/marina place. It was interesting but do put on a sunscreen as we all found out that the Ozone Layer is really gone there! We walked around the coastal front and the kid's enjoyed it.
We took a city tour so take one! Buenos Aires is what is called 'a European City' in South America. It is all about the culture: beautiful architectural buildings, parks, a courteous and well educated people and different neighborhoods to enjoy throughout their historical development. It has a pretty good Zoo also. We went to see a theater production (in Spanish, of course). It was seeing a [Broadway production] in Buenos Aires!!!! A must are the Tango shows, the Marina and eat where the locals eat (the food is great!)! Walking around in general, is safe. The famous 'Recoleta Cementary' where Eva Peron is buried is worth the visit, as it has monumental structures that are usually not used in other countries. Shopping is abundant.