Konagirl’s got it.
I grew up in Brisbane and despite what the tourist brochures tell you the best view of it is from your rear view mirror. It’s clean and friendly and has some lovely parks and gardens, but it is pretty dull, especially for kids. If you do have a day there and want some lunch, get to the Breakfast Creek hotel for a steak in the garden.
Head up to the Sunshine Coast and rent a beach house or apartment. The beaches are amazing and while it gets busy at that time, it’s not exactly crowded. Noosa is now quite developed but still has a relaxed family feel to it. heaps of shops, restaurants and markets and safe surf, so your kids will not be bored.
For a more authentic working class experience, have a look at Bribie Island. I spent my formative years there and went back about 5 years ago and thankfully nothing had changed – just a few more houses. The surf beach is rough at times but they have life guards these days. You can rent a house 5 mins from the beach (nothing is more than 5 mins from a beach) for £100 a night.
Sydney is truly superb and a trip to the Blue Mountains well worth it for the Three Sisters and Genolan Caves, but there are perfectly good rock formations and limestone caves right here in Europe. When you’re going that far Id be staying in Sydney and go tourist mad – Opera House, Harbour Bridge, The Rocks markets etc etc.
Check out all the beaches but stay away from Bondi on Xmas day. Take the ferry to Manly or a water taxi from Circular Quay to Doyles restaurant at Watsons Bay. Centennial Park is nice to wander around, have a hot dog and watch the peletons smash around at 30mph (if they haven’t banned ’em of course)
Sydney Harbour is also the best place on earth to be on New Years Eve for the most remarkable fireworks. They set a new global standard in 2000 and just seem to push it further every year.
Wherever you go make sure you have a picnic blanket and a decent sun shade you can stake down.