Opax Mountain lies northwest of Lac du Bois.   It is a sprawling, forested hill with volcanic bluffs on various flanks, wet areas on the upper plateau, grass slopes on the west ridges overlooking Tranquille Canyon, logged areas, and a few viewpoints.   There are loop opportunities, but they are not all that easy to follow.   For a first visit, use an out-and-back route, carry a GPS if you have one (and turn on your tracking), travel with someone else, and leave enough time.

The Hanging Valley route is described here:

• Park at Lac du Bois.   Follow the double track along the north shore.
• Continue through the back valley as it emerges into Hanging Valley.
• At the fork in the road, take the right fork (at N 50° 48.137 W 120° 28.522) .   It will wind up the side of the mountain under lava cliffs.
• Once you are on top of the mountain, you could wander for hours and never link up the trails.    For your first trip, follow pieces of a trail as it winds along the top of the bluffs eastward until you reach a viewpoint.
• My favorite viewpoint is at  N 50° 48.153 W 120° 29.664 on an open ledge above the lava cliffs.
• For a first venture, return by the same route.