A chilly breeze blowing across the Great Lakes separating the U.S. from Canada greeted passengers as they climbed to the top deck of the cruise ship. From the far end of the boat, three figures holding aloft an enormous helium-filled weather balloon began moving toward the gathering in an awkward six-legged parade. Expedition cruises featuring adventurous activities and exotic destinations, such as the Antarctic and the Galapagos Islands, are increasingly popular with families desiring a learning experience. The Viking Octantis, a 380-passenger vessel built to be part cruise ship and part scientific research platform, includes a laboratory and its very own submarines. The goal, says a marine scientist on the Viking staff, “is to do rigorous science that will be credible in academia and allow guests to participate.”