After the symposium finished I had a free day and managed to book a boat-trip out to a platform floating over the Great Barrier Reef.
I was concerned that I would have to remain onboard as I have a health problem which means I have to avoid exposure to strong sunlight but to my delight they supplied lycra suits and all we needed to go snorkelling over the reef ... so off I went exploring what I am told is the only living organism large enough to be seen from space. So, dream fulfilled 50 years down the line!