Brazil

Hi everyone
You should visit Brazil. This country is really amazing. Persons, foods and places are amazing. (You could also write people, food and places are amazing.)
For example: There is a small city in the state  of  Minas Gerais that has the name ,‘Carrancas”. This  city is magic because of its Waterfalls. Every place that you see, there are so many beautiful waterfalls and woods. If you’re stressed this place would be very interesting for you to take a rest. However,if you prefer to be with a lot of happy people  you should visit another small city that  is called  “Ouro Preto’ I‘ll try to translate for you in English. The name of the other city  is “ Black Gold”. Everyday there are a lot of parties. Really, a party happens inside the  houses of the  students. It’s really fun.
So, Come to  visit Brazil, everyone is  welcome in my country.

they're is okay and written correctly, but in this case I think there are sounds better.

Brazil

Hi everyone
You should to (visit) Brazil. This is country is very amazing. (The) (people), (food), and places are amazing.
For example: There is a small city (in) (the) state (of) Minas Gerais that (is named) ‘Carrancas”. This is city is (magical) because of its waterfalls. Every place that you see (there are) a lot beautiful waterfalls and woods. If you’re stressed this place is very interest for you to rest. But if you prefer a lot (happy people) you'll should visited another small city that (is) called  the name “Ouro Preto’ I‘ll try translate for you in English the name (of this city) is “ Black Gold”. Every day there (are) a lot of (parties). Really, the (parties) happened inside (the) houses of students. It’s very good.
So, Comes (visit) Brazil, everyone (is) welcome in my country.

Algumas coisas: 

plural de person eh people

plural de food eh food 

everyone eh singular, mesma coisa em portugues. nao eh "todo o mundo sao" eh "todo mundo eh"

eu nunca vi "there're" escrito. Nos falamos assim, mas nao escevimos assim

lembre: eh "happy people" nao "people happy", eh o oposto de portugues. Eh assim com todos os adjectivos: "Black cat", nao "Cat black" como um exemplo (gato preto)

**perdone meu portugues