A good question.
A local answer.

Check any path works and the weather before setting out, and carry water because exposed parts can feel hotter than the forecast.

A hotel near dinner and a simple terminal route can be better value for one night than extra facilities you will not use.

First confirm the terminal and your boarding time; Circular Quay and Darling Harbour are not interchangeable pickup areas.

Check the last service, weather and whether an outdoor deck is available before setting out.

Check height, length and overnight rules at any proposed car park; many central garages cannot accept a motorhome.

Choose a preferred date and a backup, then build ferry or road travel around the encounter time.

Check which cruise terminal your ship uses, then choose a hotel that makes the transfer and your preferred walks straightforward.

A waterfront view is one option, but a restaurant with a lively room and a menu your daughter likes may feel more personal.

Ask the rooftop venue exactly which fireworks are visible from its allocated guest area, whether views are shared, and what the ticket includes.

Look in the CBD, Chinatown and Darling Harbour precincts, then check the actual walk and recent menus for the mood you want.

Compare the official year's viewing-area map, age rules, entry time and whether the ticket includes a seated place.

Check whether tastings, lunch and any regional fees are included in the advertised price.