A good question.
A local answer.

If a beach morning matters, Glenelg is reachable as an outing without moving accommodation. Check the current tram route and return time.

A private car can give flexibility, but ask the driver for a fixed itinerary and pickup point. Do not combine distant highlights simply because they appear close on a regional map.

Check the current Adelaide Metro rail schedule from Outer Harbor and the distance from the berth to the station. Plan the return train around all-aboard time, not departure time.

Take water and sun protection, and check official trail alerts after rain or heat. Pick one area for the day rather than spending most of it transferring between walks.

Keep essential items in cabin baggage and confirm the terminal route, but do not assume fast processing on a particular morning.

If the sailing is essential, avoid a sightseeing detour on the outbound leg. Save coastal stops for the return and check road conditions on the morning you travel.

Bring layers, check the entry gate and allow time to learn the pace of play. A shorter match may suit a first visit if you cannot commit a full day.

Choose a place with bar seating or a small-table booking if you want a comfortable solo meal. Compare total prices including sides; a lunch special advertised online may not apply at dinner.

Start with the seafood traders at Adelaide Central Market and compare their current trading days. It is a food market rather than a direct copy of Sydney's wholesale-style site.

A beach day at Glenelg or a short Adelaide Hills trip is easier with children than forcing an unavailable island crossing. Check transport and opening days first.

Treat separate tickets as two flights. Immigration, baggage, biosecurity and the next airline's bag-drop cutoff can use most of a short connection.

Ask your accommodation what it can provide on arrival and check late-opening food options near the actual address. Public-holiday hours vary widely.