Buenos Aries

After surfing in Lima for a few days and relaxing I just got into Buenos Aries this morning around 5am. I am staying in a hostel near 9 do Julio Av. and Av. de Mayo. Im not sure what the plan is, maybe Patagonia. If anyone has any suggestions on where to go or what to see let me know. I have two weeks until I fly out of Buenos Aries, so I could could to Chile or Uruguay (if US citizens dont have to pay too much extra).