Pumpkins and Jack-o-lanterns. Preschool Activities and Crafts. Pumpkins are one of the best parts of fall! From big and round to small and silly, pumpkins can be turned into tasty treats, fun decorations, and even glowing jack-o’-lanterns for Halloween. In our pumpkin and jack-o’-lantern activities, children will explore the magic of the season through crafts, games, and stories — Preschool children learn about pumpkins while also expressing feelings and creativity by making their own pumpkin faces.