A good question.
A local answer.

Ask the rental company in writing whether that vehicle may travel on the ferry and whether island driving is covered by its insurance.

Pick one or two regional bases rather than treating every destination as a day trip. Kangaroo Island needs extra time for the crossing and wildlife stops.

One adult could collect the car while the others wait comfortably if that suits your family. Confirm the branch's opening hours and pickup instructions first.

Keep each day to one main outing with a short drive and a place to rest or feed the baby. A garden, easy wildlife visit and nearby lunch can be a full day.

Compare the apartment's laundry, cooking equipment, parking and cooling. The best location depends on your daily plans rather than which area sounds nicer.

Pick dinner near the stadium approach or a transport stop so you can eat without rushing. Book ahead if your preferred place is busy on match night.

Check Adelaide Metro's current payment and transfer rules before buying a ticket; an old forum post may describe a product that has changed. Keep a card or other accepted payment method ready.

If both are convenient, use recent reviews about service and room condition as the tie-breaker. Confirm the full nightly total and parking cost if you will drive.

For a small first-night shop, buy only the essentials close to the apartment. Plan a larger grocery run after you know the kitchen equipment and how much you will actually cook.

Wild kangaroo sightings within the central city are unpredictable. A wildlife park or guided nature outing gives you a more dependable chance without promising a sighting.

Choose overnight stops by daily driving time and the sights you actually value, not by a list of every possible town. Reserve accommodation before a busy holiday period.

Mix short city days with one regional outing at a time. A market, gardens and an easy meal can suit all three generations after a longer drive.