One of the best zoo deals I know is the Riverview Park and Zoo in Peterborough, Ontario. Free admission, playground, disc golf,splash pad and picnic area. It even has a 15 min. train ride (tickets $2).
Toronto Zoo gives out free passes to kids with their report card and they have special free admission days. On SmartCanucks there's a posting about Coca Cola Day (free kids admission with a Coca Cola label). Watch the zoo's special events page for more updates. or you could win 4 family passes from Attractions Ontario.
What’s great about your zoo?