The curriculum is augmented by a vibrant Retreat Program through Years 7 to 12, including a pilgrimage at Year 9 which highlights the activities and places undertaken by St Mary of the Cross MacKillop during her time in South Australia, culminating in an overnight Retreat for the Year 12 students at Nunyara in Belair.
Many of the College's graduates mention the Retreat experiences as some of the most significant events in their time at Mary MacKillop College.