The summer vacation was coming, and the students couldn't wait to have a good vacation. In the third grade summer essay, we can write a diary about our summer vacation plan or a diary about our summer vacation life. Here is an example of a 300-word summer vacation diary: Summer vacation diary I was so excited about the start of summer vacation. This summer, I'm going to take piano lessons to learn music theory and go to summer camp to play with the children. On the first day, I went to the piano class. The teacher introduced the lesson plan to me and then began my piano lesson. In class, I learned music theory and the teacher also taught me some playing skills. I'm very interested and look forward to class every day. The next day, I came to the summer camp. The summer camp was very interesting and had all kinds of activities. We took part in an outdoor game, played on the grass, and went to a museum to learn about history and culture. I feel very happy that this summer camp is a very good choice. On the third day, I went home to spend the day with my family. We'll cook and watch TV together. It was a simple day, but I was grateful for my family's company. Life during the summer vacation is very interesting. I will continue to study hard and play with the children. I'm going to have a great time this summer.