I have errors??⇩
Last Christmas my parents decided to visit my uncles and my cousins ​​to France. On this trip, it was only me and my parents. My brother could not go because he was sick and my sister stayed home to take care of him. I went to Arreau by car. The trip lasted approximately 4 hours. I was there for a week. During that week I walked the streets, bought postcards and enjoy the views of some landscapes, I was also playing with my cousins ​​in the snow. Sometimes my cousins ​​spoke French and I did not understand what she said. I had a good time and I learned a little more the language.

Last Christmas, my parents decided to visit my uncles and cousins in France. Only my parents and I went on the trip. My brother couldn't go because he was sick, and my sister stayed home to take care of him. I went to Arreau by car. The trip took about 4 hours. I stayed there for a week. During that week, I had a look around the town, bought postcards and enjoyed the view of some landscapes. I also played with my cousins in the snow: sometimes they spoke French and I didn't understand what they were saying. I had a good time and I learnt a bit more of the language.

I corrected it to what sounds natural to me: your English is very good though!! 😊

Also I changed "walking the streets" because that is a saying here for a prostitute 😂