We planned our trip with 5 days in Brisbane, which really is a bit much, ha. We used those 5 days to get our bearings, and start gathering supplies for our two month road trip ahead. I think 3 days in Brisbane would be plenty to check out the city.
It’s quite easy to use the bus system and the CityCat (both operated by Translink), and the service was reliable for us. Parts of the city are also walkable, which is my preferred way of navigating a new city.
We had the chance to visit the GoMA (Gallery of Modern Art); their permanent exhibitions are free, so it’s worth a visit. Also nice to be in an air conditioned building on a hot day. There are also lots of other museums along Southbank, some paid, some free.