My wife and I had only 1-1/2 days in Buenos Aires, and on a whim, and based on Trip Advisor reviews, we decided to try the Polo Elite polo lessons. My wife had ridden horses many years ago, but I never had. The head of Polo Elite, Fernando Nieto, picked up up from BA and drove us to the horse ranch/polo field, located near Ezeiza Airport. I was a little nervous; these weren't little ponies, but tall horses bred for the tough sport of polo. But Fernando patiently showed me how to ride the horse, and not to be afraid of it.
Once I got the hang of it, we started the polo lesson. At first, my wife and I were like three-year-olds beginning youth soccer, but we soon got the hang of it and started riding around the field and hitting the ball through the goal. When it was over, we were quite sweaty, and our right arms ached from gripping the mallet too hard, but we had enjoyed a unique experience that we will remember forever.
As for Fernando, he is very patient with newbies like me, and also just a great guy. It also doesn't hurt that his English is perfect.
If you're visiting BA, there are lots of museums in town, but, hey, there are museums everywhere. A polo lesson from Fernando, on the other hand, is something you can get only in BA. Do not, I repeat, do not miss it.