We are 2 families with a total of 4 kids ranging in age from 3 to 11 y/o. We'd like to spend 1 week in Australia. We're thinking 3 days Sydney and 4 days Cairn. What would be the best sites to book a vacation package? What are the must-see areas? Any recs on lodging? We prefer a place with a kitchen and something moderately priced. Any tips is much appreciated!