Oceania Vista: 18-Night Panama Canal

Miami cruise port, officially called PortMiami, is the busiest cruise port in the world by passenger volume. Millions of people pass through here every year, and nearly every major cruise line uses it as a home port.

Grand Cayman is the largest of the three Cayman Islands, a British Overseas Territory in the western Caribbean known for Seven Mile Beach, exceptional diving, and its role as a major offshore financial center. George Town serves as the cruise port, but there's no pier large enough for cruise ships.

Cartagena de Indias is a Caribbean port city of about 1 million people on Colombia's northern coast, and one of the best-preserved colonial cities in the Americas. The walled old city (Ciudad Amurallada) is a UNESCO World Heritage Site, built by the Spanish starting in the 16th century to protect the gold and silver being shipped back to Europe.

Stretched along Banderas Bay with the Sierra Madre mountains rising directly behind the shoreline, Puerto Vallarta draws about 290,000 residents year-round and far more during the winter cruise season. The city has managed to grow as a tourist destination while keeping its Mexican identity intact, particularly in the Zona Romantica and the malecon (boardwalk) areas where local life and tourism coexist on the same streets.

One of Mexico's oldest beach resorts, Mazatlan's cruise port is walkable to the historic Centro Historico with its 19th-century architecture and vibrant Plazuela Machado. The city's famous cliff divers perform daily, and miles of golden beaches stretch along the coast.

Cabo San Lucas sits at the very tip of Mexico's Baja California Peninsula, where the Pacific Ocean meets the Sea of Cortez. This is a tender port: ships anchor in Cabo San Lucas Bay and passengers ride small boats to the marina.