My favorite log/flume ride is the Wilderness Adventure Log Ride at Ontario Place. It's got everything you want in a log ride - thematic elements, rapids, different paced sections, great views, and a big drop at the end. I'll try to find my old map of Ontario Place and post that soon.
You can get a good idea of the layout by checking out the Adventure Island section of the park map.
Good views on Bing maps too.