We're thinking of taking the girls to the Toronto Zoo either early fall or before the summer is over. I'm thinking (US) Labor Day weekend. Is it terribly busy that weekend?

The site saids there are double strollers and wagons for rent. Anyone know how much and what kind?

How long would it take (approx) to get through the whole zoo while experiencing some of the shows and keeper talks?

Can I get discount tickets any way? Deal sites? AAA?

Any other tips? We have a 3 and 1 year old. Thanks!