Scott and I hiked the Kenomee Canyon Trail in Economy, Nova Scotia. It's 18 hard kms with the hardest portion of the trail being on the west side of the canyon. The camp sites are very remote and clean. I highly recommend this trail and that you spend a night to really enjoy it. Doing the entire trail in a day would be pretty exhausting for less than experienced backpackers.
Walking : 10 Hours Negotiating water crossings : 1.5 Hours Elevation Gain : +200 meters Day 1 / -200 meters Day 2 Total Distance Walked : 21 kms