I suggest getting a copy of the TimeOut Guide to Buenos Aires.

I also suggest http://www.argentinago.com I know the American co-owner of this business but won't get a commission.

For excursions I suggest Dia de Campo, a day at a ranch and a one-day excursion to Uruguay. BoqueBus, the ferry company, runs a good one.

Fantastic steaks are 1/3 their prices in the USA.

Bill Southern California