A good question.
A local answer.

Check the current route, walking grade and each garden's opening day before committing to an itinerary.

Ask shortlisted hotels about the precise accessible room, bathroom layout and step-free route to the entrance before booking.

If you choose the island, plan a safe late return or a tour rather than adding a tiring drive after a full day.

Use the official penguin-viewing information for current access, hours and visitor rules rather than older pier advice.

Check your bank's card fees and keep cash secure in a crowded market. Do not assume every trader takes the same methods.

Compare quality and quantities between stalls; getting the right item matters more than winning a tiny discount.

Check the unit price and freshness at several market stalls before buying a large amount.

Check the market's current trading days and which sections open on each day; an old forum comparison may no longer fit.

Build the day around a garden, wildlife stop, local produce and a meal, with travel time between each.

Start with the current regional cellar-door directory and choose a compact route rather than a long list of labels.

If city sights matter more, keep both days local and consider the island later in the road trip if your route allows.

Consider separate days or a professionally timed itinerary. Do not rely on finding a long-distance ride at the last minute.