If massages and hot tubs are your thing, you might want to check out Caliceo Aquatic Center in Bordeaux-Lac. It's also full of great shops and restaurants, so you can spend the afternoon having a wander.
If you want to see a show while you're in town, try and grab some tickets at Barriere Casino Theatre in Quartier du Lac. If you enjoy the show and want to see another, Le Rocher de Palmer, Grand Theatre of Bordeaux, and Arkéa Arena are not far.
Quartier du Lac is home to Kart System, so why not stop by during your stay in Bordeaux. It's also full of great shops and restaurants, so you can spend the afternoon having a wander.
If you're planning a bit of sightseeing head to Greek Orthodox Church— just one of the monuments in Chartrons. You could also start your cultural experience by heading over to the museums in the area.