Title: Things in Last weekend. (don't use preposition "in"; it generally means "inside")

-> Things about Last Weekend.

I went to Jinhea and joined cherry blossom festival.

-> This is a grammatically correct sentence.

The first day, It was very cold like winter. (describe your subject directly, no need for pronoun "it")

-> The first day was very cold like winter.

I tried to some foods. (Food is uncountable in general use, we don't say "foods")

->I tried some food.

But they were very expensive and terrible. (you can either connect this to the previous sentence or remove "but")

-> They were very expensive and terrible.

So, I was disappointed. (it is better not to start sentences with conjunctions, include this to the previous sentence)

-> They were very expensive and terrible so I was disappointed.

In next day, I went to another place. (use proper preposition / use article "the" when necessary)

-> On the next day, I went to another place.

There were many cherry blossoms and lots of things to interesting. (use words appropriately and it is better to put adjectives before the object that is being described)

-> There were many cherry blossoms and lots of interesting things.

Foods also was good. (Food is uncountable in general use, we don't say "foods" / use "the" before the subject "food" because you are pertaining to something specific)

-> The food was also good.

I came back in sunday night. (use preposition <in, on> properly; in this case it is not necessary / capitalize name of days or months)

-> I came back Sunday night.

>>>>> I am pleased to have corrected another composition of yours. I really appreciate the time and effort that you alot in writing. In this composition, I pointed out many concerns and I hope you do not mind that I am very strict with the corrections. I only want to share the best knowledge that I can impart on you. I wish this could help you.

Thank you so much and you can write a composition anytime. Lastly, I admire your diligence.

Job well done!

-Teacher Liza