Read the text carefully and answer the questions.

A Lovely Day

    I went to the park yesterday. The weather was sunny and there were a lot of people in the park. Two little boys were playing volleyball. A man was walking with his son. A boy was sitting on a bench and reading his newspaper. I walked down the park and saw some of my friends. They were playing basketball. I said hello to them and went on walking. An old woman was watching the birds with her grandson. A girl was riding her bike. While she was riding, she fell down. I went towards her and helped her. She thanked me and went on riding. I looked at my watch. It was about five and I decided to go home. It was a lovely day.

What was the man doing in the park yesterday?