When you're picking a cruise, the first question used to be "Where do I want to go?" These days, the traveler is just as likely to ask "What do I want to do?" Some options for a themed cruise:
Art and architecture: Wind through the waterways of some of the world's most prominent architectural capitals, including Venice, Istanbul and Athens. Consultants will help you learn to apply the lessons of the master designs to decorating your home (from $4,915; crystalcruises.com).
Sinatra: Celebrate big bands with the top arrangers on many of The Voice's greatest hits. Afternoons onboard the seven-day crossing from France to Funchal, Madeira, are filled with 1950s and '60s classic films and informal talks with Rat Pack friends (from $2,937; rssc.com).
Cars: Formula One fans can live vicariously through Sir Stirling Moss and Murray Walker, hosts of Celebrity Panel events, as you tailgate aboard Silversea's six-star charter headed to the Monaco Grand Prix (about $5,470; itcsports.co.uk/monaco).
Coffee: Spend a week studying how to make the perfect home brew on the way to Mexico. Learn such skills as caffe latte art and coffee cocktails. Bring home the best gourmet beans from retailers from around the world (from $800; coffeecruises.com).
Books: If reading is your passion, book a berth on The Written Word Silversea Cruise, and join renowned editors and authors for entertaining lectures on the story behind the story. Next up: writer Marie Brenner, whose article became the basis of the movie "The Insider." (from $4,695; silversea.com).