Sep 12, 2017. One of its top trails is The Crack, a difficult 6 kilometre hike to the top of the Killarney Ridge. While it may take four to six hours, The Crack Trail. Explore Killarney on Foot. Killarney is world renowned for its hiking. Hike along the ridges of the LaCloche Mountain Range. Explore the 100 km of stunning white quartzite hills in Killarney Park. As part of Ontario…