What surprises did Willy Wonka have for the children?

Willy Wonka surprised the children with a tour of his fantastical chocolate factory, showcasing innovative and whimsical creations like the chocolate river and edible wallpaper. He also introduced them to his Oompa-Loompa workers, who sang cautionary songs when the children misbehaved. Additionally, Wonka presented each child with a unique, unexpected experience tailored to their personalities, such as the fizzy lifting drinks or the shrinking and stretching room.