A good question.
A local answer.

Compare the real walk from the hotel and a table size that lets five people share comfortably.

Keep one flexible Kalbarri block for weather and park access rather than committing every hour.

Read recent guest comments for birds and for practical matters such as kitchen, access and transport.

Use the rental company's current booking instructions for the exact terminal and branch, since airline terminals can change.

Bring the cases to the pickup desk or measure them before booking; both model names cover different years and configurations.

Check each day's drive and children's rest needs before adding another coastal detour.

Check the cruise's actual Australian port and disembarkation date, then map the onward trip to Perth.

Compare current cellar-door and food opening days before assuming Monday has enough options.

Compare the same car class with full excess, kilometre, additional-driver and roadside terms.

Have a nearby non-swimming activity ready when wind, surf or weather makes the water unsuitable.

Check the actual arrival time in Perth and leave the first day light after long-haul travel.

Place market trading days and the ferry booking first, then arrange hotel moves around them.