Our little travel group had arranged a couple of rooms on a Junk Cruise of Ha Long Bay and Bai Tu Long Bay. Another UNESCO World Heritage site full of incredible karst formations, the bay is one of the most popular tourist destinations in Vietnam. A fleet of cruise ships of all kinds — from classic-style wooden boats to modern, posh vessels — ferry tourists around the bay on sightseeing cruises with various activities. We particularly enjoyed our trip aboard the Treasure Junk which included a kayaking excursion from our boat on the first afternoon of the cruise; it was very cool to get up close and personal with the karst hills and cave systems within them.