Keep the kids entertained by making your sightseeing excursions in Australia as fun-filled and varied as possible - with a little planning, this is easily done in such a large country full of endless natural and manmade children's attractions!
Wildlife, for example, will be a big favourite with your little ones, and Australia's vast array of colourful birds and cuddly animals will certainly appeal to them. Be sure to check out some of the zoos and wildlife sanctuaries: Sydney's Koala Park Sanctuary is ideal (an also has a collection of other native animals such as kangaroos, dingoes, wombats etc.), and children will love something like the Australian Woolshed in Brisbane - a glimpse of life in the outback, which allows kids to try their hand at milking cows and bottle-feeding lambs, or even to take part in a traditional bush dance!
Of course, there will be plenty of 'touristy' things that you want to see and do in the big cities, and there's no reason why that needs to be boring for the younger members of your party. Let them see Sydney Harbour from a different perspective by taking a ferry from Circular Quay to Manly, thus adding a bit of excitement to the experience for them. In fact, this is a great tip for keeping children entertained when you're travelling: just find unusual ways of making the journey! A ferry, a JetCat, the monorail... there are plenty of creative ways to make travelling fun. Particularly popular with tourists, and especially amongst the younger ones, is Melbourne's tram network - especially the City Circle tram, which is free and a great way to get around the city. There are lots of fun options like this, such as the Steam Ranger Tourist Railway in Adelaide, and Melbourne's Puffing Billy steam train.
Kids love beaches, and Australia has plenty of those to offer. Many have play equipment for children, and lots of shaded picnic areas and BBQs. Check out the beaches on the Sunshine Coast, such as the Golden Beach in Caloundra - here, you'll find plenty of waterspout action, and warm, calm waters that are ideal for young swimmers. There are also some great park areas where kids will happily spend hours tiring themselves out: South Bank Parklands is a perfect example, with its swimming lagoon complete with sandy beach and rocky creeks that just beg to be explored.
Visiting museums and similar attractions can also be fun for the kids in Australia - just pick some of the more unusual ones, and you're guaranteed that they'll have a wonderful time. What child wouldn't enjoy the National Dinosaur Museum? And Ripley's Believe It Or Not! Museum will delight every child, with its bizarre exhibits and mysterious stories. Throw in some education with a trip to one of Australia's many science attractions, like the Sir Thomas Brisbane Planetarium, or Spotswood's Scienceworks (where you can see Australia's very first car and plane), and give them some hands-on experience at the popular (and interactive) Questacon - the National Science and Technology Centre. Young space enthusiasts will demand to see the Deep Space Communications Complex, which is a NASA tracking station near Canberra.
There's definitely no shortage of things for the kids to do in Australia - and we haven't even mentioned the theme parks...