Great Adventure Cruises
Courtesy of Celebrity Cruises
A trip aboard the 96-passenger Celebrity Xpedition is manageable enough for a multigenerational crowd—but that doesn’t diminish the thrill of watching 800-pound tortoises lumber near you. At night, head to the bar for a pre-dinner cocktail and a talk by a naturalist about the next day’s activities. celebrity.com; seven-night cruises run year-round; from $3,200 per person.