Johnston Canyon is a beautiful hiking trail. You follow the river most of the way and end at a gorgeous waterfall. The trail itself is very easy to travel.
During the summer the path is always busy with tourists. The best time to go is in late spring and early summer. There is still some ice left, but the river and falls are flowing nicely. The sound of running water is very relaxing. During this time there are also fewer people to ruin the serenity.