C Noma
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The main best attraction is an overnight cruise to Lan ha Bay and Ha Long Bay. Recommend going with Cat Ba Ventures. You may also want to spend an overnight here before the cruise or afterwards. (downside is that there is a lot of trash and debris in the water which is disturbing as a “westerner”. There appears to be no effort by the government to require the local operators of the day cruises or the local fisherman to keep the water clean. Vietnam should follow the example of the Philippines in Palawan, where the beautiful waters are treasured, and the scuba diving and snorkeling is phenomenal.)
We stayed at the Moon Boutique which is affiliated with Cat Ba Ventures. It’s very cute hotel and reasonably priced with a very good breakfast. Cat Ba Ventures will also arrange for your transportation from Hanoi or Ninh Binh/Tam Coc . However, if your budget is a bit higher, consider staying at the 5 star Perle d’Oriente hotel, which is adjacent to Cat Co 3 beach with a lovely pool, a nice beach, a full pool side bar. Just a note, there is a lot of construction going on by Son world of a huge hotel complex with a man-made beach and yacht Harbour, which commenced in late 2024, and as I understand, it is scheduled to be a five-year project. But if you take the cruise boats, you will not see or be bothered by the construction.(Moon Boutique does look out on the construction. The five star hotel, Perle does not. )