[.ca] Mountain Bike Here: Ontario and Central and Western New York (ISBN 155046292X)

Get out and ride, and take this book with you.:
This is a great book to get out and around if you don't have "inside" information on where to bike. I can only comment on the Central Ontario section, which is fairly complete, although it does leave out a few county forests that are excellent rides. One weakness of the book is that the trail maps are not very accurate, especially in large, relatively unmarked areas like Durham Forest, where a compass is usefull. I highly recommend this book. Added bonus is that a lot of these trails make great cross country skiing in the winter.