One possible version： Dear Xiao Hua， 

I have just come back from a trip to the United States．I had a very good time there． I first went to New York．It is really a very big city．I saw quite many skyscrapers there．But the Twin Towers of the World Trade Center ale no more to be seen．Two days later l went to Los Angeles．I visited Hollywood on the day I got there．After that I spent a whole day in Disneyland．It is really a wonderful place you shouldn’t miss．I also went to Reno，Nevada． There is a beautiful lake named Dahu．The scenery there is attractive!

I hope you will take a trip to the United States some day．