Is one night and a full day in Nancy enough to see the city and surrounding area? I would be coming from Lyon before heading to Paris to fly home.
I'd say that depends on how interested you are in Art Nouveau. The city has an Art Nouveau museum and a lot of Art Nouveau architecture. In wandering around in search of the latter, I also encountered some Art Deco. A day would be too short for me, but I'm all-in on that sort of thing.
Here's the city's tourism web page where you can read about other local attractions: https://www.nancy-tourisme.fr/en/to-see-to-do/heritage-and-culture/museums/
I love Art Nouveau and one of the reasons I’d go there. My husband is more into nature and scenery, so I’d need to add some stops that incorporate his interests. Suggestions for such stops between Lyon and Nancy?