A good question.
A local answer.

Count door-to-door travel, opening hours and the return journey, not just entry price. A boat ride can be part of the experience if its schedule fits.

A one-way boat option, if currently offered, may give you the river ride without fixing your return time. Confirm the alternative transport before booking.

Read the operating coach company's boarding instructions directly. An intercity booking is different from tapping on and off a local bus or tram.

For casual browsing, choose a Brisbane market with a simpler route. You can spend the saved time exploring nearby cafes rather than travelling for a similar stall mix.

Ask the hotel about late arrivals and nearby options, but compare reviews and prices yourself. A place ideal for breakfast may not serve dinner.

Choose places reached by one straightforward route and check the last return service. A nearby coastal or riverside outing can be more satisfying than a long multi-transfer journey.

Confirm which cruise terminal the ship uses and its all-aboard time. The terminal location makes a large difference to the road transfer and usable hours.

Check the actual cruise terminal and all-aboard time before setting the minibus schedule. Road travel from different terminals can vary considerably.

Before booking, map the full six days and leave one unscheduled block. The ferry and cycle network are more enjoyable when you can stop rather than race to another attraction.

Choose an address with several meals and a river or city walk nearby. Check the exact route on foot rather than judging by the suburb name.

Keep the Sunshine Coast as a separate day if it matters to you. Combining it with a social visit often leaves too little time for either.

Choose one regional day by interest, such as wildlife, coast or hinterland, and leave the third day flexible for weather or work preparation.