I am planning a little trip to Sydney with my husband and teenage son. We are going to go just after school breaks up in December, for three or four nights. We live in Perth, and none of us have been to Sydney, and will be staying in Surry Hills. WE want to do the major tourist stuff, OPera House, Bridge, the Harbour (maybe a boat trip) etc. Is the zoo worth a visit? What shouldn't we miss? And would three nights be enough or should we do four? Any tips much appreciated.