Hi Jinny!

Thank you for doing your homework. I love to read your thoughts about going on a trip. Like you, I also want to go to Paris and see the Eiffel Tower!

With regards to your sentences, please take note of the corrections. Thank you!

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I don't have plans to go to on a trip but if I will go, the first thing that I'll do is to I want to eat delicious food.

~ This sentence has a good ideas; though you lacked to add proper words to complete it's meaning. Please check the words added to it. :)

Next, I want to see beautiful buildings or structures like the Eiffel Tower.

~ Check the spelling of the word "structures."

I want to go on a trip.

~ It has the same case with the first sentence. Please review it. 

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-----> CORRECTED PARAGRAPH :

I don't have plans to go to on a trip but if I will go, the first thing that I'll do is to I want to eat delicious food.
Next, I want to see beautiful buildings or structures like the Eiffel Tower. I want to go on a trip.