When I visited Cairns many years ago I think I had only an hour or so to spend on a Green Island visit, so I did a quick run around its circumference and headed back. I think there was a glass-bottomed building or something too. It was a long time ago!
Anyway, on this trip we made a proper day trip of it. There's quite a lot to see and do these days. And despite the enormous crowds of tourists, it all seems to be well-managed and the place is not too damaged by them.
You can snorkel the coral reef, or view it from a glass-bottomed boat, or stroll the beaches, or just lounge around.
There are very comfortable boats to ferry you to and from the place too these days. It's 45minutes from Cairns.
