Planning to spend 2-3 nights per city over 10 days in the following areas. Hoping to see local areas/attractions, including night markets, walking tours, cuisine, location-specific attractions (caves, bays, museums, landmarks, etc) and learning about the local culture in Hanoi, Ha Long Bay, Hoi An. Also considering Da Nang, Cat Ba Island (near Ha Long Bay), Ninh Binh - max 4 locations over 10 days.