The Slow Way to Macau
Macau gets treated as a day trip and a casino floor. It is neither, and the way you arrive shapes which version of it you get.
Three crossings, one recommendation
You can cross the delta by ferry, by bus over the long sea road, or by air from further afield. The bus is usually cheapest and least affected by weather. The ferry costs a little more and takes about an hour. The flight only makes sense if you are not coming from Hong Kong in the first place.
I take the ferry, and not because it is faster, because it frequently is not once you account for the terminals. I take it because arriving by water is how this place has always been arrived at, and because the approach gives you the geography in a way that a bus in a tunnel cannot.
The one thing worth knowing regardless of which you pick: this is an international crossing with immigration on both sides. Treat it like a flight. Arrive early, keep your passport out, and book the return leg at the same time as the outbound, because the evening sailings back to Hong Kong are the ones that sell out.
The old town is a morning
The historic centre is a connected sequence of squares, churches and fortifications, and it is small. You can walk the whole listed route in a morning at a pace that lets you actually stop. By eleven the coach groups arrive and the staircase in front of the ruined facade becomes a queue for a photograph.
Start at first light instead. The paving is empty, the light comes in low across the stonework, and the cafes on the squares are opening rather than full. It is the same route, three hours earlier, and it is a completely different experience.
Then climb. The fortress on the hill is the only place the layout of the territory becomes legible: peninsula, islands, water, and the towers on the reclaimed land in between. Everything you walked through in the morning arranges itself from up there.
Eat the thing that only exists here
Macanese food is not Portuguese food and it is not Cantonese food. It is a distinct cuisine that developed over centuries in exactly one place, out of Portuguese technique, local ingredients and whatever came through on the trade routes. There is nowhere else to eat it properly.
The family-run restaurants are the ones worth finding, generally away from the main squares and often without much of a shopfront. Portions are built for a table rather than a person, so going alone is genuinely harder than going with someone.
This is the argument against the day trip in one sentence: you can see the old town in a morning, but you cannot eat properly, climb the hill and cross to the islands and still catch an afternoon ferry back. Stay a night. Two if you can.
What I got wrong last time
I gave it seven hours and treated the islands as optional. They are not optional. Taipa Village and Coloane hold the quiet, low-rise, lived-in version of the territory, and skipping them leaves you with an impression of Macau that is essentially a casino district with a ruin attached.
I also wore the wrong shoes, which sounds trivial until you have spent a morning on wet mosaic paving. That one is in the tips on the destination page now, because it is the mistake I would most like to save someone else from repeating.