This park is huge -- it's Montréal's equivalent of Central Park in NYC or Golden Gate Park in San Francisco. There are massive open spaces and wide, groomed-dirt trails for people to walk, bike, or jog. If you take the trails all the way up to the top, there's a huge empty building that looks like it could host giant receptions and galas, with a large patio with a great view of the city.
There's a giant pond with paddleboats in the summer, and ice skating in the winter! Plenty of picnic areas, too.
It's definitely a great spot to check out if you are in Montréal. Especially since the park is FREE! (parking costs money, though).
OHMIGOD - I just realized that the entire city of Montréal is named after this place!!