Norooz vacation

There is Norooz vacation in at the beginning of spring.
In Over these days, we go to visit my parents, and we have very many guests.
We go to a park and watch look at beautiful trees, flowers, and grass and listen to voice the sound of the birds.
We cook bake different cookies.
I love Norooz

Great job!

Since the vacation starts right on the first day of spring, you should say "at" instead of "in".

"Watch" is more active than "look". "Watch" is like پاییدن, "look" is like نگاه کردن. If you were saying that the trees, flowers, and grass were doing something (like growing), you would say "watch," but "look" is better for what you wrote.

The verb for cooking food in an oven is "to bake".

Norooz mobarak!