The hike to the summit of Mount Bisoke (3,711m) is the best day's walking in the Virungas available to trekkers. The trail leaves from the same Kinigi trailhead as the gorilla treks, climbing steeply through bamboo forest, then through hagenia woodland, and finally up bare volcanic slopes to the summit crater. The round trip takes six to eight hours. At the rim, a perfectly circular crater lake — deep blue-green and surrounded by cloud forest — makes the effort worthwhile.
The climb requires reasonable fitness and good footwear — the upper volcanic scree is loose and the path becomes slippery in wet weather. A park guide is mandatory and included in the permit fee (around US$75, far cheaper than gorilla permits). The guide manages the pace and knows the condition of the trail. Porters are available for hire at the trailhead.
The gorilla families and golden monkey groups are sometimes encountered in the forests below the summit, making this a potential double experience on the same day for particularly energetic visitors. The view from the summit on a clear day extends south across the Rwandan hills and west into the DRC.