Thornapple River is a 14 mile trail located near Hastings, MI. The trail is primarily used for canoeing and sea kayaking and is accessible from May until October.
For Grand Rapids area and not wanting to do much tripping on the Grand river this river works wonderful. There was a group of us that went out about 10 people 5 canoes for an afternoon trip. we only did 10 miles but it was peaceful and average flow.