I'm going to review this island based on the two half-marathons I've done this year. I've been to LaRonde in the past and its ok, but lets talk about the island.
For running (in a race or just to run), its super scenic. Theres amazing views of the water, the city, trees and even some trails. I really enjoy it and the races I did there (one in February when it was -33 and one in April when it was 12 outside) were both really good even though the weather was completely different. I recommend coming here for a run for sure!
Its also nice and clean. Theres music festivals that happen here in the summer but theres so many people its insane!