The perito Moreno glacier is one of Argentinian's biggest attraction. The fastest receding glacier is very impressive. Hop on the boat tour to check out live ice breakage.
You can decide to pay for tours or just hop on a bus there if you short on cash. If you do have a few pennies to spent, I'd recommend getting a tour that takes you on a walk directly on the glacier.
There's not much more I can say to describe this icing beauty. The only thing I will add is go check it out before it all melts.