Gray Line Halong is the first overnight cruise of Gray Line World Wide, a prestigious American brand founded in 1910. Complimentary to Gray Line’s own set of core values, Gray Line Halong’s motto embodies a commitment to treating each visitor as a friend and local. It goes without saying that every product is fine-tuned to provide experiences, whether they pertain to culture, adventure or the unique cuisine, that are true to the Vietnamese way of life.