Cairns in Queensland is the typical stopping point for folks looking to dive the Great Barrier Reef. But in addition to the joys of the tropical weather and the large bats (and I genuinely like Cairns as a town), they have a world-class tank museum. It's nice to have a tank museum at a place that people actually want to go to, so if you're on your Aussie vacation, drop the family off at the Esplanade and drive up the ten miles from downtown. They also have an annual "AusArmor Fest", where the theme is visitor involvement. Not many other places let you ride in a Panzer IV or T-72.