The Cumberland Island Group lie protected inside the Great Barrier Reef, off the coast of Mackay. St Bees Island is within the Cumberland Island Group, and is a quiet volcanic isle fringed with reefs, rainforests, eucalypt woodlands, and dense grasslands which is accessible from Mackay by private transfer. 
The island offers basic share accommodation in a largely solar-powered cottage with hot showers and toilets and camping options with basic amenities. The island offers the opportunity to relax on your own private tropical island beach under the palms, and tides allowing, snorkel around the reefs or fish in the lagoon. St Bees Island has also been the research point for Central Queensland University and University of Queensland who have been investigating the population of wild koalas on the island.
Source: http://www.queenslandholidays.com.au/destinations/islands/st-bees-island-9005394/index.cfm