One young player, five-year-old Amelia Te Tamaki of Ardmore Marist Rugby Club, was presented with a Rugby World Cup Champions Medal by Williams to wear for the afternoon.
Her mother, Jenn Jury, was delighted with her daughter's moment in the limelight, saying "it was very exciting, especially for me!"
The young fans were also treated to two games of ripper rugby with Williams taking on players from Manurewa High School's first XV.
Seventeen-year-old vice-captain Raymond Fuilala thoroughly enjoyed his time playing alongside the Chiefs midfielder, joking that "Sonny wanted me on his team".
Counties Manukau RU development officer Jeremy Wara said he hoped the visit would increase the registrations for the region's clubs. "We are hoping for at least 7500 players this year, which means around 4500 juniors."
Ask Kamo: Former All Blacks Ian Jones answers your questions on the state of rugby in Friday's SuperSport.