Get tickets and join the fans at a game at Arenas de Plumacon. If there's nothing on while you're in the area, you might like to check if there's a guided tour of the grounds.
This sporting facility in Mont-de-Marsan comes recommended by travelers, so put it on your to-do list. Don't think that's all there is to do here, though. There are loads more spots ready for you to discover after Arenas de Plumacon. Mont-de-Marsan Golf, Stade Guy Boniface, and Parc Jean Rameau are close by.