For Buena Park Downtown store events, click here T'ai Chi Instruction at Buena Park Downtown Ongoing - Friday mornings at 9AM in the Entertainment Plaza. Find out why T'ai Chi has been performed for over a thousand years to promote good health, relaxation and spiritual well-being. Registration is through the Buena Park Recreation Department. For a registration application, call: (714)562-3844. Cost: $4 per class, $20 for six classes