Halong Bay in Vietnam is one of the Seven Natural Wonders of the World. The document describes excursions on Emeraude Classic Cruises that explore the natural beauty and landmarks of Halong Bay, including hiking in Sung Sot Cave, visiting floating fishing villages, swimming at Hang Trong Cave, and watching films on deck at night. It also provides background on the history of cruise operations in Halong Bay and the inspiration for the Emeraude cruise founder.