Aboard Galeb, we cruised like a bunch of teenagers on a graduation trip. Luci, 31, and Chris, 48, were on an exodus from Brexit. The Polish engineers Arek, 27, and Łukasz, 28, friends since childhood, flipped their settled lives for adventure. Alice, 20, an adventurer from Quebec, was earning her sea miles. And then there was me, a 32-year-old perpetual traveler making a great circle back to the Caribbean after sailing to Europe in July.