A decent size park along the Martin Goodman Trail located just east of Ontario Place. Coronation Park has three baseball diamonds, an off-leash dog park, and plenty of benches within the park. There's also a picnic area and public washrooms on the premises with limited parking along Remembrance Drive.
I love running through this park as it contains ample trees which provides some shady relief during hot and sunny days, plus it's usually the turnaround point during my short runs, so this park works for me.
The view of Lake Ontario is stunning by the south end of the park which always feels very zen to me. Great spot to take in the city skyline, watch the sunrise/sunset, watch the Porter planes land and takeoff, plus see the many boats moored by the two yacht clubs.
Coronation Park is also a great space for events almost year round, but the spring/summer months sees plenty of races end at this location because of the vast size of the park.