Toronto Orienteering Club puts out ribbons for courses in a Toronto urban park on Wednesday evenings during the summer. A public transit bus goes to the entrance of the park being used on July 29th. It's a decent park, expect some big climbs (the park includes a ski hill). From the TOC website: "New, for TOC members only: If you find you can’t attend the Wednesday meet, but would like to run the course, send an email to the event coordinator. We’ll provide you with a PDF of the map that you can print to run at your convenience." Although it says for TOC members, as a visiting foreign orienteer, I would suggest emailing the Wed. coordinator about being able to do the same, although the week's map might not be ready for printing before Wednesday night.
http://torontoorienteering.com/wp/?page_id=10