From 1933 until the early 1970s, the famous Kelleys Mansion was owned by the Dominican Sisters of Adrian, Michigan, serving first as a retirement/summer home for sisters, then later as a summer camp for girls. (Note cross on the mansion in photo.)
Apparently, at some time in the early 1900s, the Fathers of the Blessed Sacrament also had a presence on the island, staying in a structure rebuilt from the John Stokes wine cellar (see link):
A Mass for the Feast of Our Lady of the Rosary will be broadcast on EWTN live from Rosary Cathedral, on October 7, 2009 at 12 pm EST, with a re-play at 6:30 pm EST.
Photo from a 1939 issue of the Catholic Chronicle. BGSU's Center for Archival Collections has records for the St. Joseph Syrian-Lebanese Melkite Mission included with Toledo's St. Francis de Sales Catholic Church, as the mission met there from 1929 - 1954.