A good question.
A local answer.

A flexible ticket can be useful, but confirm whether a particular coach is actually reserved.

Choose reserved seats with a clear view and a convenient exit route if that feels more comfortable.

Check a few central shops or museum stores for quality and easy packing.

If a street feels uncomfortable, use a direct ride or staffed venue rather than continuing solely because it is the shortest route.

Check bridge or path access on the match day and allow extra time for crowds.

Check current station locker or staffed-storage availability and size limits for the luggage.

Keep enough balance for the first trip and note any separate airport transport fare.

Price insurance, tolls and parking with the quoted daily rate.

Arrange help with luggage from the terminal to the vehicle if the party cannot lift the bags.

Check seasonal opening for ferries, wineries or attractions before fixing each day.

Choose the festival and city if local atmosphere and a gentler schedule matter more after Phillip Island.

Compare today's city fare caps with the rides actually planned; do not rely on an old card price.