This is only 45 minutes from Buenos Aires. The Delta is a network of canals, brooks, rivers and islands which make up this leafy paradise. The town of Tigre is a gateway to the Delta. In Tigre there are many examples of the country's belle époque, with beautiful turn of the century buildings, and other quaint and very unique attractions like the Mercado de Frutos or the Club de la Marina, along with the amazing natural scenery.
My proposal is to leave at 9:30am either in train or you can hire a van (at an extra cost). Once in Tigre we can wander around. Later, we can take a boat for over an hour along the canals (at an extra cost of about usd12 per person). I highly recommend this as you will be able to experience the life of the islanders.
After sailing we could have lunch either in Tigre itself or make our way to the Old Town of San Isidro. This town is another example of the Belle Epoque as it is made of beautiful mansions. We will do a mini tour around the area including its beautiful cathedral and main square.