The Hoai River has carried trade vessels, fishing boats, and ceremonial processions for more than four centuries, but its most luminous cargo appears only after dark. Each evening between five and half past nine, wooden sampans drift beneath the Japanese Covered Bridge and past the Assembly Halls of Fujian and Cantonese merchants, their passengers releasing paper lanterns onto the current in a ritual that blends Mahayana Buddhist merit-making with the tourism economy of a UNESCO World Heritage site. The practice gained momentum in the early 2000s as Hoi An Ancient Town pivoted from obscurity to one of Southeast Asia's most photographed destinations, yet the lantern itself — a silk-and-bamboo frame holding a single candle — descends from centuries-old festival traditions tied to the full moon and ancestor veneration. A Hoi An city evening tour with lantern boat ride occupies the narrow window between civil twilight and full darkness, when the ochre and mustard facades along Bach Dang Street hold just enough natural light to register on camera sensors while the lantern shops and tailor storefronts begin their neon glow. The Hoai River at this hour becomes a procession of small craft, each carrying two to six passengers and a boatman who poles through the shallows with practiced economy. The water itself is tidal and brackish, fed by the Thu Bon River system that once made Hoi An a waypoint on the maritime silk route linking Guangzhou, Manila, and Batavia. By the sixteenth century, Japanese, Chinese, Dutch, and Portuguese traders had established warehouses and clan halls within a five-minute walk of the riverbank, and the architectural record of that convergence — tube houses with ceramic-tiled roofs, carved wooden doorways, and courtyards open to the sky — remains intact along Tran Phu and Nguyen Thai Hoc streets. The lantern boat ride itself is a twenty-to-thirty-minute drift, typically departing from small docks near the Cau An Hoi footbridge or the night-market zone on Nguyen Hoang. Operators provide one or two cylindrical lanterns per passenger, pre-lit and ready to release; the act of setting a floating lantern onto moving water is brief, silent, and oddly communal, as dozens of other boats perform the same gesture within sight. The river carries the lanterns downstream toward the estuary, where they extinguish naturally or are collected by cleanup crews before dawn. Most evening tours bundle the boat segment with a walking loop through the Ancient Town, stopping at the Japanese Covered Bridge, Tan Ky House, or the Quan Cong Temple, all of which remain open past sunset and charge no separate admission beyond the standard heritage-site conservation ticket. The entire experience unfolds within a twelve-block radius, compact enough that visitors on foot can cover the same ground in under two hours, yet the boat portion compresses Hoi An's appeal into a single frame: colonial architecture, artisan commerce, and ritual gesture converging on a tidal river under strung bulbs and paper stars.