Recreation The Oak Brook Park District works to provide a diverse range of opportunities designed to keep you and your family happy, fit, and active. Fitness Our first-class fitness and wellness facility includes a wide variety of amenities, including three regulation-size gymnasiums, fitness center, indoor walking track and more Aquatics Oak Brook Park District’s award-winning indoor Family Aquatic Center offers year-long programming for all ages. Tennis Improve your tennis game with programs at the Oak Brook Tennis Center. Get a great workout from Cardio Tennis.