This is a vacation everyone will love: Even when you're at sea, you'll be entertained every minute. Your first port is Riviera Maya, home to white-sand beaches and mysterious Mayan ruins. Next up is Limon, Costa Rica, where you can kayak through a rainforest or visit a banana plantation. Your last stop is Colon, Panama—and you can even add a trip through the famed Panama Canal.

"Fun Ship," indeed: Liberty's pool deck has a 214-foot water slide at one end and an enormous movie screen at the other, as well as tons of exciting, supervised opportunities for kids to play and mingle. The younger set can choose from arts and crafts, trivia, and talent shows; older kids get dance parties, late-night movies, and teens-only lounges and shore trips. Find out more.

Carnival is dedicated to family cruising, offering a huge variety of organized activities for kids ages 2 through 17, as well as child care for infants on up. Many cabins offer extra beds for kids, or you can book a “family cabin” with bigger windows and bedding for four. There's plenty of fun for adults, too—an excellent alternative restaurant, the Czar's Palace Casino, and Spa Carnival.
Find out more about Carnival Cruise Line.