A good question.
A local answer.

Bring warm layers even in summer and keep an on-land alternative if the forecast makes boating unpleasant.

Check the ferry operator's current departure point and boarding cutoff, then choose parking within an easy walk of that pier.

Choose one longer walk or several short lookouts, then check trail conditions and daylight before committing.

Coordinate arrival with the track's current check-in and boat requirements before buying transport.

Choose either a Hobart day or a Huon Valley drive for Sunday, and check road and attraction hours before departure.

Compare current menus in the CBD, waterfront and North Hobart for cuts, price and sides rather than relying on old recommendations.

Decide whether you want a casual waterfront meal or a longer restaurant dinner, then check recent reviews for that style.

Choose one main outing per day, such as the waterfront, a mountain visit or a peninsula trip, and leave free time for parks.

Use normal city precautions: choose lit routes, keep valuables secure and plan how to return after dark.

Give Cradle Mountain its own weather-flexible time rather than treating it as a quick stop between valleys.

Arrange a lower-level parking or pickup plan with an authorised operator rather than assuming a private car can reach the snow safely.

For a return uphill after dinner, a short taxi can be easier than committing to the same walk twice.