I love this place. It has some beautiful trails with lots of big trees and a lovely pond, right in the middle of Mississauga. The trails range from easy to medium - some take you down to the Credit River, where you can continue walking along the riverside for much longer if you're adventurous.
My first time exploring I tried to do a few trails with a stroller, which is a stupid idea since they're TRAILS and obviously not paved, and my baby was like "mom, you're an idiot". But the second time around I busted out the carrier, and we both had a much better time. There's a beautiful art centre building nearby with clean bathrooms, and a barn which I haven't been able to explore yet.
I have yet to see a variety of wildlife except mosquitoes so... expect mosquitoes. Plenty of parking (two lots), and accessible from the bus stop on Burnhamthorpe (but a bit of a walk in from the main road). This place is a gem and I think everyone should go check it out!