Celebrate Earth Day at the Children’s Zoo’s Party for the Planet! Guests can learn how to take care of our earth by visiting the conservation booths. The first 400 people with a recyclable container will receive FREE admission into the Zoo! This event marks the first day of the 2017 season. Children's Zoo, 1730 S. Washington Ave., Saginaw. From 10 am - 2 pm. Admission $5.00. Phone 989-759-1408.