Halong vs Lan Ha vs Cat Ba
Route zones not whole bay one cruise.
Каркас
Ha Long Bay core — Sung Sot cave, Titop island, floating villages Cua Van (staged tourism). Lan Ha south — Cat Ba gateway, less traffic, same karst. Bai Tu Long east — fewer boats, longer transfer. Ha Long City port — mass joiner boats. Tuan Chau marina — resort pier many cruises depart. Cat Ba town — alternate embark overnight cruises.
Развилка
Route map > brand name: ask night 1 anchor bay. 2N cruise > 1N if Hanoi worth it. Cat Ba day bike — weak vs second night on boat per many reviews.