Brittany Chang/Business Insider
- Royal Caribbean's Icon of the Seas will begin its first seven-night sailings in January
- The new world's largest cruise ship has unprecedented features like a six-slide water park.
- These are the nine things travelers should know about what it's like on the new mega-ship.
I was one of the first guests to sail on Royal Caribbean's newest vessel: The $2 billion Icon of the Seas, the world's largest cruise ship.