Do a search on this topic here. We've covered this in the past.
Been there the past 5 years in a row and going again this year. Spend the extra money and get a hotel that is the the Montreal Metro (subway) area. Get to Montreal on Friday and purchase the weekend Metro pass $15 and you have unlimited rides on the Metro all weekend. Its perfect to get around town and to the track.
Here's a link to the Metro map: