At a Florida retirement home for former circus elephants, residents enjoy a steady diet of high-quality hay and local fruits and vegetables, as well as baths and occasional walks. For these majestic beasts, this life of relative leisure at the 200-acre Center for Elephant Conservation comes after years on the road, entertaining America in “The Greatest Show on Earth” for Ringling Bros and Barnum & Bailey Circus. In March, the circus company announced with some reluctance that it would end its elephant acts by 2018.