According to forum posts, from Hanoi to Halong Bay, travelers can choose between shared bus services, private car hires, or limousines. A shared limousine service costs about $30 USD for a round trip per person, while a private transfer by car can cost around $90 USD one way.

Some travelers mentioned that cruise packages often include the transfer via an air-conditioned shuttle bus, taking about 3 to 4 hours each way. Additionally, there are limousine bus services to Halong Bay that cost around $15 per person one way.

For those looking for a unique experience, a seaplane service offers aerial views of Halong Bay, though it's more costly and doesn't provide a direct route to Hanoi. For a comprehensive experience, some cruises also provide round-trip transport services as part of their package.

According to forum posts, popular cruise options in Ha Long Bay include Paradise Grand, Indochina Junk, and Bhaya cruises. These cruises are recommended for their quality services and scenic routes, covering iconic spots such as Lan Ha Bay and Bai Tu Long Bay.

For travelers seeking less crowded experiences, Bai Tu Long Bay and Lan Ha Bay are frequently suggested. The Indochina Junk offers a 3D2N cruise in these areas, providing a more secluded and intimate setting. Additionally, the Dragon Legend and Swan Cruise are noted for their enjoyable itineraries in Bai Tu Long Bay.

For luxury experiences, the Paradise cruise and Indochina Sails cruise are highly recommended. Budget-conscious travelers have enjoyed the Swan Cruise and Indochina Junk, which offer more affordable rates without compromising safety and comfort.

According to forum posts, Halong Bay is more popular and well-known, leading to higher levels of crowd congestion. Bai Tu Long Bay, on the other hand, is described by some travelers as quieter and less crowded, making it a preferable option for those seeking a more serene experience.

Some users have noted that Bai Tu Long Bay is cleaner compared to Halong Bay, which has been reported to have issues with garbage and pollution. This has made Bai Tu Long Bay more appealing to environmentally conscious travelers.

While Halong Bay is famous for its iconic rock formations and caves, Bai Tu Long Bay offers a more untouched and natural environment. However, both bays are part of the larger Halong Bay region, and the differences in scenery between them may not be drastically different, as noted by some travelers.

According to forum posts, the Au Co Cruise is highlighted for its luxury and comfort, offering a 3-day experience where guests stay on the same cruise without needing to switch boats. Another recommended option is the Indochina Junk’s Dragon Legend Cruise, which is favored for touring the less crowded Bai Tu Long Bay.

Some travelers also recommend the Perla Dawn Sails, which features unique dining experiences such as a dinner on a floating farm. The Stellar of the Seas, which sails to the less frequented Lan Ha Bay, is praised for providing a quieter and higher-quality experience.