Consider Mont-Saint-Michel Island.
During low tide.
Re: Isola Bella. It is absolutely a magnificent place. I visited there in September 2019! It was a landscape architect’s dream.
Re: Mont St. Michele. I have always regretted not joining the group from Harvard in our summer grad program in France, 1977. Regrettably, it was dealing with arrogant dumb and dumbers and an unrequired day in the van with them seemed unbearable. Should have swallowed hard and gone to see it.