Their names are:
Caledonia Island
Craig Island (Craig and Caledonia are joined by a narrow reef)
Lenagan Island
Nelson Island
Pelican Island
Rock Island
Yes that's six but Craig isn't actually considered an island (since it is connected to caledonia). These islands were used first as a housing area for the indentured labourers being brought from India after the end of the slave trade while waiting for the documentation to be processed. After that, it has been used as holiday homes for Government/Colonial officials, Housing for lepers and a prison. The islands have for the most part been abandoned for the past three decades, there are still some dilapidated structures on some of the islands.