A few weeks ago I went to Beaver Lake Park with my folks and of all the parks we went to this was my mum's (or mom's in American-speak) favourite. I suspect it is probably because of the beautiful big trees and the tranquil body of water.
Paddle boats ready to be launched on perfectly still waters. The folks that live here have it pretty good.
I've been back several times since to go jogging around the area and it is very peaceful. The only downside, like much of the wilderness so close to the city, is that it is limited by the surrounding private property.