Terry,
Great suggestion about the CG in Perce! To correct your typo, it is Camping Du Phare and is listed in most campground guides. If further contact info is needed by the Lynches, drop me a note.
While there be sure to visit Bonaventure Island, but when choosing a boat for the excursion, there will be about a dozen tour operators at the dock. Ask for and ensure you take the one that has the largest boat..for comfort and for safety.
Also the tour operator you choose should provide free parking near the dock, as the distance between Camping Du Phare and the dock is too far to walk, and there is no meed for you to pay for parking while on the excursion.
Wear good shoes or hiking boots, take a bottle of water and a lunch as well as you camera with lots of film or memory chips.
Photograph the Rock while on the boat for a unique perspective as well as photographing the wildllife on the way to Bonaventure Island.