A portion of a split-rail fence has as much attraction as expensive playground equipment for youngsters during a picnic for the Church of the Covenant Preschool 3-year-old class last month at the Stone Pavilion in Washington Park. Sixty children, along with parents, participated in the picnic at the park. Sitting on the rail, from left, are 4-year-olds Carson Shore, Gabriel Antoinette, Evan Berdar, Elle Ryan, Trevor Flowers and Audrey Proudfit.