My last Holiday

The Last summer, I went to California, United States. I was have been in three different cities, San Francisco, Los Angeles and Las Vegas, in Nevada.
The first city that I've visited was Las Vegas, where people never sleep and the night is so bright. There were was Casinos to everywhere, and people never stop betting. I was in the Luxor Hotel, New York New York, Bellagio, and many others. That was amazing.
The second city was San Francisco with its streets and its bay. The fresh air and the seafood is so special. The Alcatraz Prison is in the middle of bay. People were very friendly and the city really nice.
The last City was Los Angeles, the city where the stars live. There were many iconic buildings, the Chinese theatre, the Griffith Observatory, the Hollywood sign, and many others. I met with the movie stars Alex Pettyfer, he is really kind.
This is my summary of my last holiday, I hope that you like it, and I hope to come back soon to the USA soon.

Bye

Hi Mariano! Great story! Your English is very clear. It was very easy to read and to understand what you are writing about.

Here are a few tips about verb tenses: 

Use the simple past here because you are talking about one trip that is now completed:

"I was in three cities"

"The first city that I visited was..."

You can use the present perfect "I have been" / "I have visited" if you are emphasizing that the action is not completed, e.g.

"I have now been in three cities in the United States"

"I have already visited 3 cities, and I plan to visit many more".

Hope that helps :)