As the sun sets over the Iowa Arboretum... the Halloween Ar "Boo" Scare event begins. Darkness, sounds of time past and hidden surprises set the stage for Halloween night. Walk the "No Return Hidden Trail" and ride the "Hayride to the Valley of Darkness." Bring a flashlight, wear a costume and enjoy the cool night air. Look for carved pumpkins, scare crows and lots of treats and treasures at this night event.