A different day maybe say "A special day"- sounds more natural

It was sunny, and I thought it was cold.

The landcape was very beautiful, there waswere a lot of colours. Part of the mountain was covered in snow, but the other side was still greenand a part was snowed, other was green. And. the views of Madrid, the mountains, and the trees were marvelous were marvellous, mountains, trees and in the distance Madrid.

We were walking for five hours and after the hike we went to eat a fantastic restaurant that a friend said us had recommended to us\

Awesome job! Keep up the good work!

A different day

It was sunny, thought though it was cold.

The landcape was very beutiful (beautiful) .  Tthere was  were a lot of colours and a part of the mountain was covered in snowed, while another part other was green. The views, mountains and trees  were marvellous, mountains, trees and in the distance, we could see Madrid.

We were walking walked for five hours and after we went to eat a at a fantastic restaurant that a friend said recommended to us.

Very good story!  You cannot start a sentence with the word AND.

It was sunny thought it was cold.

The landcape was very beutiful, there was a lot of colours and a part was snowed, the other was green. And the views were marvellous, mountains, trees and in the distance Madrid.

We were walking five hours and after we went to eat at a fantastic restaurant that a friend told us about. (or you could say "that a friend recommended to us")

Sounds wonderful! The picture is very pretty too.