My favourite way to appreciate the Humber River is to park at Etienne Brule Park, just north of Old Mill Road, right by the stream. Two parallel trails follow the river, one for bikes and the other for pedestrians. They're bordered by tall trees and even cliffs on both sides of the river at some points, creating unique intimate sceneries. Six low dams, spread along the course of the stream between Old Mill Road and Dundas Street, control its flow, hence the lovely sound of cascades we hear as we walk. With kids, it takes half an hour to walk from the parking lot to the Dundas overpass. Note that for a longer stroll, you could park in the public parking lot at the end of Humber Valley Road (many use it as a starting point for a bike ride), walk 5 minutes to the entrance of the trail by the Toronto Humber Yacht Club, then walk 15 minutes to get to the Old Mill overpass to finally reach Etienne Brule Park. There's nothing striking about that part of the trail along Humber River but my kids found it intriguing to walk under the bridges along the path.