The summit of Mont Jacques-Cartier, at 1270 meters, is the highest mountain in the Gaspé, and the second highest in the Province of Quebec.
Most people can hike to the summit in between 1½ - 2 hours. Note that you can't drive your car to the trailhead. Your best option is to purchase a ticket at the information center for a shuttle that leaves there on a 40-min drive (via a school bus) to the start of the trail.
Also keep in mind that the temperature at the summit can be about 8°C cooler than at the base, and with a strong wind, it can be quite chilly even in August. I'm glad I packed a sweater and a light pair of track pants in my backpack. I was wearing a ball cap, but wish I had thought to bring a toque.
The trail, though not terribly steep, is quite rocky. Sturdy hiking boots are advisable, and most climbers carry hiking poles.