jelly: i went sydney more than 10 years ago....things might have changed
my more recent trip to Aust was to Perth, it's actually not a bad place to go r&r.
Sydney: Must go:
- Darling Harbour
- Bondi Beach
Based on 8 days recommendation, i think the blue mountains B&B accomodation looks really nice and romantic. can try if u like that
Gold Coast:
- Visit the 3 worlds, good if u like amusement rides
Perth:
- try to stay at Karri Valley resort (South of Perth City), i stayed there the last time, the room balcony was facing the lake, with trees opposite, nite time can go and see the stars (it's dark and the stars seem so close). The restaurant had a full glass panel, with the lake and lights shining, very nice view. in the morning go for a walk to see the waterfall.
- Farm stay. The one i went had very nice scenery, u can do stuff like feeding the baby lamb, bbq.
Really depends on what you like to do. Relax or adventure, or play. maybe that will help u decide the location, cos each of the city has its own charm