Best known for its trio of ships with sails, Windstar Cruises doubled its fleet with the 2013 purchase of three small ships from Seabourn that it calls its Star Plus “power yachts.” Now, this premium cruise line offers itineraries around the world. The six ships — Wind Star, Wind Spirit, Wind Surf, Star Pride, Star Breeze, and Star Legend — accommodate anywhere from 148 to 342 guests, and the atmosphere is upscale but relaxed, with an emphasis on visiting a mix of popular and more out-of-the-way ports. Sure, the power-yachts don't have sails to catch the wind, but they're still intimate vessels — with the bonus of much larger staterooms than their tall-masted fleetmates.