Hi John,
Firstly I hope you enjoy your visit down under. Bring your summer clothes for Sydney, expected maximum of 35 degrees celsius here today.
A visit to the Sydney Observatory might also be worth a look for you too,
http://www.sydneyobservatory.com.au/. There is an exhibition on till 12 October, The David Malin Awards, highlighting the skills of our astrophotographers.
All the best.
Regards
Wayne