Lone Pine Koala Sanctuary is the star: the world's oldest and largest koala sanctuary, home to around 130 of them, plus kangaroo paddocks where you hand-feed the mob. Queensland permits held-koala photos, which Sydney and Melbourne do not — if that picture is on your list, take it here. The boat cruise up the Brisbane River to Lone Pine turns the visit into a half-day outing.
South Bank is the city's playground — riverside gardens, the flower-covered arbour walk, and Streets Beach, a free man-made lagoon with real sand facing the skyline. The Queensland Museum and modern-art gallery (GOMA) sit at its edge, both free for general entry.
See the city from up high. The Wheel of Brisbane at South Bank does the easy version; the Story Bridge Adventure Climb does the thrilling one; and Mt Coot-tha lookout gives the free sunset panorama over the city.
Cruise the river. CityCat ferries are ordinary public transport, which makes them the cheapest sightseeing in Brisbane — ride the full loop past the cliffs and under Story Bridge for under A$5 ($3.50).
With an extra day, choose between Moreton Island (sand-dune tobogganing, wreck snorkeling) and Australia Zoo, the Irwin family's park, about an hour north.