I did mine in English, and the kids did it in French. The tour guides dress in period costume, and took us to various parts of the hotel, incl the grand ballroom, etc. Old pics of Churchill and Rooselvelt and King meeting, and so on. Very informative, and just fun. Really enjoyed it.
And of course we went nearby to tour the Citadel as well. Really worth it.
Quebec is one of our favourite places to go in the summer!