GCCL’s singles’ cabins

For its 2016 riverboat and small-ship cruises, sailing in 17 countries in Europe plus Morocco, Panama and Antarctica, Grand Circle Cruise Line (Boston, MA; 800/866-5892, www.gct.com) is adding more than 600 single-passenger cabins, a 21% increase over the number of single cabins offered in 2015. 

Also, many GCCL cruises do not charge single supplements. Of those that do, if a passenger finds a lower price for a single on a comparable trip for Americans, GCCL will meet that price plus deduct $500 off the cruise cost. GCCL also helps passengers find same-gender cabin mates to share the cost of a double.