The Trélon castle is located at the heart of a country with an extremely rich history and heritage. Here are a few suggestions if you want to explore the surroundings: museums, restaurants, hotels, etc.

La Ferme du Pont des Loups (Cheese farm)
http://www.fermedupontdesloups.fr/

Le Musée du Verre (Museum of Glass)
http://musverre.lenord.fr