Should we hire a car for all five nights in South Bank or just for day trips?

Put one coastal destination on each driving day and check the route at your intended departure hour. The time spent getting out of town can vary markedly with traffic.

Compare the rental's overnight parking, tolls and airport pickup fees with a shorter city pickup. A very early return flight may justify a separate airport transfer rather than several idle car days.

Keep the car for the days that actually require it. South Bank and central Brisbane are easier to enjoy on foot, ferry and public transport than with a parked rental.