Mont Blanc is one of the longer hikes in the Percé area, reached by the Sentier de la Crevasse. The trail follows the edge of a deep cleft in the mountainside before climbing to broad views over forest, coast, and the Gulf of St. Lawrence.
It takes more effort than the shorter walks to the Grotto or Mont Sainte-Anne, but that is part of the appeal. Go in clear weather, wear proper shoes, and allow enough time to enjoy the lookout rather than treating it as a quick roadside stop.