Try looking around the Marais Poitevin for cycling routes. (
https://www.af3v.org/les-voies-verte...rais-poitevin/ is a starting point.)
https://www.tourisme-deux-sevres.com/itineraires-velo
https://www.routeyou.com/fr-fr/locat...eraires-a-velo
https://www.deux-sevres.fr/nos-missi...ires-cyclables
You might like to explore the Forest of Mervent-Vouvant, La Rochelle and the coast and the Ile de Ré, and for something different, the Futuroscope Park near Poitiers is unique. You'll have a lovely time in this relatively-unexplored part of France ... and good food and wine too! Bonne Route!