Hoi An is Vietnam's lantern-lit trading port turned open-air museum, a car-free Ancient Town of merchant houses and tailor shops where the Thu Bon River glows after dark.
February to April for the driest weather and comfortable heat before the summer humidity sets in; the Full Moon Lantern Festival happens monthly regardless of season, so time a visit around the 14th lunar day if that's the draw.
Cao lau (a Hoi An-specific noodle dish with pork and greens, made only with well water from the region) and banh mi are the two dishes to seek out, alongside the night market's grilled skewers and banana pancakes.
Base yourself walking distance from the Ancient Town's pedestrian core to be close to the lanterns after dark, or across the river in Cam Nam for a quieter, more local stay a short walk from the same lights.
Book any custom tailoring on your first day in town, not your last — a good suit or dress typically needs at least one fitting and adjustment, and rushing it on your final afternoon limits how much can be corrected.
Read more in Hoi An Travel Guide: Lantern-Lit Streets & the Ancient Town and Vietnam: towering karsts, lantern towns & dynamic cities.