The Johnston Canyon hike has been called moderate by some but we’d call it easy. It is just 2.5 km (return) to the Lower Falls and 5 km (return) to Upper Falls. Yes, there is some uphill involved but anyone with reasonable mobility should have no problem. The Johnston Canyon hike isn’t completely flat but it is smooth and well-marked. If you want to continue to Ink Pots you're looking at about 12 km return so this is a much bigger undertaking.