In Buenos Aires you can find it all, you can go shopping, dancing, the best shows, sports, a casino boat, you can learn how to TANGO! (remember, it takes two for that ;) ) the Hotels are incredible, from one star to five but you will feel like Royalty, that I can garantee.
Buquebus (travel agency www.buquebus.com for more information) is offering city tours, they are cheap and you are not gonna miss a thing :), although it could be more fun just grab a map and explore, get to know the real city and find yourself in the process, don´t worry if you get lost, just go to the subway and get down in a major avenue or ask any police man, don´t take a cab if you don´t know where you are, they are not that safe and they will charge you a lot more if they can smell you are lost.
A better option is a remise, they will charge you before the trip by the agency, you are not require to give money to the driver, that makes it the safer way to travel around the city.
When you think you are done knowing Buenos Aires , you are not even close :P, did you went to China town? , Palermo Viejo? , Palermo Hollywood? , the famous cafés in the Serrano Square. Quilmes, Lanousse, "El Tigre" (please do take a water cab!), You must walk in Once where you can find a pair of jeans (ralph lauren, CK, YVSL) for just 10 bucks! Sorry I am excited I just love Buenos Aires, because it´s a real mix of people, culture, things, you want it , they give it to you. Just that simple.
In november I would love to go to the Fireball 9-ball championship, but I think I won't be able to :( so, good luck damn you! to those that have the chance and miss me!