A good question.
A local answer.

Confirm pickup, waiting time, cancellation and any mobility equipment in writing. Build rest breaks into the itinerary rather than filling every available hour.

Book a cancellable rate if available, then recheck prices closer to travel without assuming they will fall. Consider whether a smaller vehicle still fits your bags and route.

Confirm the depot's address, opening time and whether it offers its own airport shuttle. A short map distance may still be awkward with luggage.

Compare the total from your arrival to departure time, not just the advertised evening rate. A new daily charge may start earlier than you expect.

Keep the last stop near a reliable airport route and allow for ship or road delays. A flexible short itinerary is safer than a fixed full-day checklist.

For a SIM, check your phone is unlocked and compare airport and city shops. Confirm activation requirements before relying on mobile data for navigation.

Verify the transfer time from the airport to the bus stop before paying for a place to sit. Keep a buffer for baggage and traffic.

Check the return service before paying for the hotel. Regional departures may be limited, so build the visit around the timetable rather than assuming a late return.

Check current WA child-restraint rules and request the correct seat for the baby when booking. Do not assume a standard taxi or rideshare arrives with one.

Check the exact apartment size, kitchen and laundry facilities you need, then compare recent room-condition reviews. Property names alone do not show what a specific unit includes.

Compare the exact apartment's walking route to the beach with the total price and minimum holiday stay. A beach suburb can have fewer grocery choices at holiday hours.

Search rental branches by the exact CBD address and operating hours, not only the airport. Some city branches have shorter weekend hours.