"Bienvenue cyclistes" is a Quebec initiative where campgrounds reserve some camping spots for visitors travelling exclusively by bike. Those site cannot be reserved in advance and are always available (in theory, they might get crowded if you have to share with a bigger group, but in practice that hasn't happened to me yet).
At this location, there's picnic table, a fire pit and a screened-in wooden shelter (pictured) large enough for perhaps two to four people to sleep in. Outhouse and drinking ware are a few meters away and shower, water toilet, and laundry are in the main Lac Phillipe campgrounds a very short bike ride away.