The Mercer Island Saddle Club is a cooperative non-profit club supported by the volunteer work of its members. Located on the south end of Mercer Island, the Saddle Club houses a 20-horse barn, a large outdoor arena, a covered arena, a hot water wash rack and two turnout paddocks. Members can board their horse, lease a horse and take riding lessons with independent trainers. The southeast quadrant of Pioneer Park, directly east of the MISC, provides 40 acres of equestrian trails for riders.