Mui Ne
This spectacular bay and Natural Heritage Site stretches across the Gulf of Tonkin, 165 km from Hanoi. Hidden among more than 1,600 limestone formations, are secret grottoes, sparkling beaches, and jaw-dropping caves. The best way to go is on an overnight cruise. Mornings are for watching the sunrise, practicing tai chi or sightseeing in the caves. Afternoons are spent swimming, kayaking or simply relaxing on the sun deck. Evenings arrive with striking sunsets and soothing sea breeze, and leave behind a sky riddled with stars.