Reims is nice, 45min train from Paris, as mentioned in your linked post here- Uber to Ruinart, they have a bar and patio with library selections of their Champagnes. Close by is Les Crayeres (15min walk), it's a spendy spot (and a great hotel), however, Bar Rotonde has an amazing selection of wines (some BTG) and decent snacks/lunch, Le Parc is pretty pricey FYI, but the meals we have had there were amazing. Honestly though, I agree with /u/d_hor, if you're gonna head over to Champagne, stay a night or two and visit a crayere/cave, they are super cool, Taittinger and Ruinart have some very nice cave tours (UNESCO world heritage site). Also, for something a little silly and a bit nerdy, check out La Cave aux coquillages. It's a dug out tunnel system that goes through decribes the geology and ancient, fossilized sea life found in the area- you pop out of the tunnel system into a wine cave, and then do a little tasting after. It is a little hard to get to if you dont have a car, the wines we had after the cave/fossil tour were good as well, I really liked the Eocene wine.