In the story "A Valentine's Day Field Trip," a class experiences a delightful Valentine's Day under the guidance of their substitute teacher, Mrs. Twig. The students craft personalized valentines with creative decorations, each showcasing individual flair, such as glitter, stickers, and drawings. Joaquin overcomes a challenge with scissors, while others illustrate heartfelt messages. After completing their valentines, the students embark on a field trip to the post office to send their notes, hoping to uplift their regular teacher, Mrs. Thomas, who is absent. The day concludes with a festive classroom party filled with singing and games. Two days later, they receive a heartfelt message from Mrs. Thomas, expressing gratitude for their thoughtful valentines and sharing that she will return soon.