My husband and I are going to be in Brisbane for 3 days in May. I was hoping to get a glimpse of the Great Barrier Reef during our stay, even if its just the Southern most tip ... Can this be done in a day? Also, we have not decided whether to hire a car for our stay. Is it wise to rely solely on public transportation if we want to visit the Sunshine and Gold Coasts? THANK YOU so much for your help! Any advise is appreciated!