REVIEW: Ha Long Bay / Castaway Island Tour with Vietnam Backpacker Hostels adrescher1 September 30, 2011 Experiences, Ha Long Bay, Hanoi, Reviews, See Vietnam, Southeast Asia, Vietnam 1 If you're visiting Hanoi, you can't miss Ha Long Bay. A paradise of almost 2000 majestic limestone rock formations that tower over glistening emerald waters. Looking out onto Ha Long Bay, it’s absolutely gorgeo...