My graduation trip.

I have been to USA twice, but I have never been to NY.

I am looking forward to seeing one of the big cities in the USA.

I will be visiting the New York Stock Exchange and a few investment banking buildings.

because my friend will begin working at government banking from this April and I majored in

In addition to this, I will be visiting Harvard University.

I'd like to attend graduate school in the USA in the near

Harvard is one of the most prestigious universities in America and in the world.

good opportunity to feel "real university".It will be a good opportunity to get a feel for the university.

Lastly, it is expensive for me to go to New York, so I did not intend to would not go there.

But my parents pay me paid for the ticket for me.

For that I am thankful to my parents.

I will visit New York with my friends for a week starting this Sunday.

I have been to the USA twice, but I have never been to New York city.

I am looking forward to seeing one of the bigger cities in USA.

because my friend will work at government banking from this April and I'm majoring in

I'd like to attend a graduate school in the USA in the near the

It is a

good opportunity to see what a "real university" feels like.

Lastly, it is expensive for me to go to New York, so I would not have been able to go there,

But my parents payed for the ticket.

I will visit New York with my friends for a week from this Sunday.I think I get what you mean, but you might want to try this word ordering to make more sense: "This Sunday, I will be visiting New York for a week with my friends" OR "I will visit New York for a week with my friends." (not sure what you meant by "this sunday")

I have been to the USA twice, but I have never been to NY.

I am looking forward to seeing one of the biggest cities in USA. This is a superlative adjective, and so it must be "biggest"

I will vist visit the New York Exchange Stock and some an investment banking building. Use "an" here because it conveys a different attitude. Saying "some" investment banking building" may tell the reader that you don't care as much about seeing this building or even what its name is, while using "an" doesn't imply any meaning. You can use the word "some" though, but it's just a suggestion to use "an" instead! :)

because my friend will work at a government banking firm (or) company from starting this April, and I major in

In Aaddition to this, I will visit Harvard University.

I'd like to attend graduate school in the USA in the near the

Harvard is one of the most prestigious universities in America and in the world.

a good opportunity to feel like I'm at a "real university".

I hope I can feel New York's air.Not sure what you meant by this sentence.

Lastly, it is expensive for me to go to New York, so I would not go there.Phrase the sentence like this: "Lastly, it is expensive for me to go to New York so I would not have been able to go had my parents not bought me a plane ticket."

But my parents pay bought me for the my ticket.You should combine this sentence with the last, but I made corrections here anyways :)

I will be visiting New York with my friends for a week from this Sunday. (You already said you will visit New York for one week, so using "from" is not necessary because you are implying the length of time. You could also say "I will be visiting New York with my friends for a week starting this Sunday.")

I have been to the United States USA twice, but I have never been to New York NY. ("USA"-->"the United States": in writing and speech the U.S. always has "the" in front of it because it's a proper noun with the word "state" in it, and we normally never say U.S.A.--it's either "the U.S." or "the United States.")

I will visit the New York Exchange Stock and some investment banking buildings. (add "the" because you should write "the ____" when talking about a proper noun (NY Stock Exchange) that is a company name. "building"-->"buildings" because you said you will visit some, implying more than one.)

because my friend will work in government banking from this April and I major in ("at"-->"in": you use preposition "in" when you are working inside of a field/occupation. You also don't need to say "from" again because the time is implied in the sentence when you say "this (coming) April.")

I'd like to attend graduate school in USA near the in the near

Harvard is one of the most prestigious universities in America and in the world. (add "most" because you are trying to say it's one of the best, so you need a superlative "most" with the adjective "prestigious.")

a good opportunity to feel experience a "real university".

Lastly, it is expensive for me to go to New York, so I normally would not go there. (You are going to New York this time, so you would add in "normally" or "usually" to demonstrate that this trip is an exception.)

But my parents are paying me for the ticket.