A lot has changed from the last time I wrote this in 2008. The options for getting to Toronto and Pearson are much better. I went to BUF a few times a while ago but now there aren’t good Star Alliance options from BUF and they’re not that much cheaper, so I haven’t done it for a while.
Here are various options for carless transportation from Waterloo in 2019.
One of my strange hobbies is walking to or from airports. In the ideal case it is walking between the airport and the place I am sleeping. I flew into YOW in December 2019 and had the opportunity to take a 13km walk.
Complete gallery: https://gallery.patricklam.ca/index.php?/category/1209
From YOW, out on Paul Benoit Driveway past the Ottawa Hunt and Golf Club, to Riverside Dr, meeting the Rideau River at Mooney’s Bay and “civilization” at Billings Bridge, then across the Rideau on Bank through the Glebe and Centretown to Albert St and my destination.