first story

This is my first story on this site.
I started this site because I want to be a better English speaker / writer.
I have been learning English for more than 15 years ; from the age of 12 till now, but I don't use English for daily life.
I wanna brush up on my English and communicate with foreigners both in Japan and in the world.

最初の投稿
英語がよく話せるように・書けるようになることを目指してこのサイトに登録しました。
英語は中学以来15年以上習ってきたけれど、普段の生活で使う機会があまりありません。
英語を上達させて日本や世界中の外国人の人たちと交流したいです。

I would probably say this like : "Thinking about where to go for my summer vacation excites me."

Translation

Please help me to correct the grammatical mistakes. Thanks!
Kung Fu is a folk name of  for China martial arts. It can date by the need of self protect, (I'm not 100 percent sure what you mean here, but my suggestion is "It existed as a form of self-protection"), a hunting activity and a military drill in ancient China. It's one of the Chinese traditional sports both young and old all do. It has gradually evolved into a unique element of Chinese cultural culture . Gong Fu, as a national treasure for China, includes hundreds of various styles and is the most-practiced martial arts form in the world. Some styles imitate the movement of animals, others are inspired by Chinese philosophical thoughts, myths and legends.

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You did a great job on this! You use very advanced grammar and vocabulary- keep up the good work! :) 

If you have any questions, feel free to ask.

Costa Rica

My country is in Central America, and it's known worldwide for its nature. In Costa Rica, you can find a lot of beautiful scenery and adventures. The country is a very touristy destination.
One of the most popular things in Costa Rica are the beaches. We have a lot of them in the Pacific coast and in the Caribbean coast. Both coasts have different weather and culture. For example, the Caribbean coast is more humid and it's a nice place to experience the Afro-Caribbean culture.
There are more beaches in the Pacific coast, because of that is more popular. There are really big and fancy hotels, but you can also find nice, and regular hotels or hostels.
We have also a lot of volcanoes. The most popular are the Arenal volcano, the Poas volcano and the Irazu volcano. You can visit these volcanoes in a one day trip, but I recommend going to Arenal volcano for more than one day. There you can go to the hot springs, hiking or zip-lining, so it is better to go at least for a weekend.
Also, there are a lot of jungles that you can visit and hike in.
The capital city, San José, it's not a very touristy place, but it's a nice city. You can find some nice places, and experience the costa rican culture. There are a lot of museums, theaters, nice parks to rest, etc.
Costa Rica is a small country in Central America, and it is also quiet and nice. We are blessed with a lot of Nature and we produce most of our energy with hydro-electric power. I like living in Costa Rica and having the opportunity to enjoy all the nature that we have.

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Very nicely written and interesting article!! I'd like to travel there someday- 

let me know if you have any questions

Here, I waiting my girlfriend

I'm from colombia, I am living in the city Bogotá. I'm waiting my girlfriend, she are visiting a friend and come on more later. because we will gone to eat at night. Before we go my house....thank you for you help. I need improve my English my English is not very good.

------------------------------------------------------------highlights are corrections, colored texts are explanations

Here, I am waiting for my girlfriend.

I'm from Colombia, and I am living in the city of Bogota. I'm waiting for (because waiting is an intransitive verb, a preposition  like 'for' or 'on' is needed) my girlfriend, she is (singular subjects use 'is', 'are' is used for plural subjects) visiting a friend, and will come later (the -er form of an adjective isn't used with 'more' because late is one syllable, you can just make it "later"), because we are going out to eat ("will go to eat" is also okay here, but sounds less natural) at night, before we go to my house. 

that is technically correct, though it's more common for people to say either "turn right/left on ___street_" when giving that kind of direction