In the Mushroom Meadow — Alison Inches

Max is tired of being too little to ride bumper cars. But then he and Emmy are shrunk to a tiny size by shrinking violets in Dragon Land. Now he and Emmy are smaller than a blade of grass, and Max wishes he was back to his original little size. They ask the biggest of the little creatures for help, and soon discover that sometimes it's the littlest creatures that have the biggest ideas.