My happiest moment is my happiest day on vacation that I learnt a lesson. My friends and I planed to swim today, but on our way to the beach, we saw an old lady were crying,we were interested in what happened,and we asked her.Then we learnt that her little dog which were her only patner was missing,so we decided to help her to find the dog. According to the lady"s description, we started our plan. Even though we worked hard,the dog were"t fond.We were sad a little.But we did"t give up. Suddenly,one of our friends shouted to us,and said she fond the little dog.At the moment,the old lady ran to the friend,and the little dog ran to her at the sight of her. We were happy ,because we halped a lonely old lady find her only friend,though we can"t swim.We learnt that giving others happiness is giving happiness to our own,so today is my happiest day on my vacation.可能会有些许错误,请见谅!