If you are staying in BA for more than 4 days, use one of them to go to Colonia in Urugauy. You catch a ferry that takes you up the River Plate. It takes about 90 minutes.
Colonia is a World Heritage listed town and you can see why as soon as you get there. Cobbled street, picture perfect houses and a natty little light house to climb.
For lunch go to the yatch club and get a table outside. Sit back and enjoy whatever Chef recommends.
Colonia could easilly be the most charming town in the world I can't recommend it enough.
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