Cost of Excursions on Ponant

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We’re looking at a potential cruise on Le Champlain in 2020 and I’m advised that excursions are not included.  Given the port times it seems that we may have some difficulty in arranging independent excursions and I doubt that CC will be helpful. So does Ponant charge an arm and a leg for tours or does it cost a whole body, like Oceania?  Examples would be great.