As the cruise industry expands and grows, its one-size-fits-all vacation model is changing to include — and often feature — specialty theme cruises. From arts and education to dancing, sports, and offbeat cultural trends, those who never thought of themselves as “cruise people” might now be tempted to climb aboard.

BASEBALL GREATS  MSC Cruises hits a home run hosting a series of baseball-themed cruises in the eastern Caribbean aboard MSC Poesia. Each voyage features at least five baseball stars, including Cookie Rojas, Ken Griffey Sr., Stan Bahnsen, and Rico Petrocelli. Players host trivia games, question-and-answer sessions, and storytelling events. Hone your skills in pitching, hitting, and defense strategy clinics, and enter the passenger pitching contest. At the end of each cruise the players sign autographs. Round trip from Fort Lauderdale, Fla. Feb. 23, March 9, April 6. Rates from $559 (February) and $499. 877-665-4655, www.msccruisesusa.com/us_en/Cruise-Departures/Theme-Cruises/Baseball-Greats-Cruise.aspx