Hạ Long, a city on Vietnam’s northern coast, is a jumping-off point for Hạ Long Bay, a broad inlet of dramatic, often mist-covered limestone islands. Replicas of traditional junk boats tour the bay and depart from the city’s Bai Chay district. Bai Chay also has an artificial beach, a casino, cafes and dozens of hotels from resort-style complexes to hostels.