These big, bold, loud ships are packed with activities you wouldn't expect to find at sea — from ice skating rinks and rock climbing walls to skydiving simulators, bionic bartenders, bumper cars, and even surfing simulators. Just how big are these vessels? The fleet includes the largest cruise ships in the world, among them 2024’s Icon of the Seas, which accommodates as many as 7,600 guests, and 2022’s Wonder of the Seas, which sails with 7,084 passengers when it is at full capacity.