Norwegian Sun: 11-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.

Falmouth's historic port was purpose-built for mega-ships and sits in a town known for its well-preserved Georgian colonial architecture. Popular excursions include Dunn's River Falls, bamboo rafting on the Martha Brae River, and Montego Bay beaches.

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.

Colon sits at the Atlantic (Caribbean) entrance to the Panama Canal, serving as the port of call for ships that transit the canal or stop before or after the crossing. The Colon 2000 cruise terminal and the nearby Cristobal pier handle the cruise traffic, both located away from the city center in secure port compounds.

Cozumel cruise port is one of the busiest in the Caribbean, with multiple ships docking on the island every day during peak season. Cozumel is a flat, laid-back island off the eastern coast of Mexico's Yucatán Peninsula, and it's been a cruise staple for decades.