Travel to Argentina

A year ago, I was in Argentina. It was a wonderful trip, and I went with my family. We had a cool time in this country, and we spent our time visiting tourist places, like Casa Rosada, Palermo, Boca Junior Stadium and Carminito. The weather was good. I visited parks and museums too. In my opinion, a trip to Argentina is a must in your agenda. I hope that in the future, I would visit this amazing place again!

--------------------------------
  está fazendo muito bem ;)

Travel to Argentina

One year ago,[no comma needed here] I was in Argentina. It was a wonderful trip and I´ve gone with my family. We had a cool time in this country and we spended our time visiting tourist places, [no comma needed here] like Casa Rosada, Palermo, Boca Junior Stadium[optional comma here - see below] and Carminito. The weather was good. I´ve visited parks and museums too. In my opinion, a trip to Argentina is a must in you agenda. I hope that in future, I would will or can visit this amazing place again!

I'm just picking up from UkeLela's corrections, which I agree with.
Good work!
There seems to be a change in the use of the "serial comma" in English now. It used to be that you didn't use it before the last item in a list: One, two and three.
But it is in many style manuals (for publications) now to use it: One, two, and three.
Not a real important thing but worth mentioning. Don't worry about it.