Icon of the Seas - Guesstimania Reveal

The Icon of the Seas is the largest cruise ship in history.

How big is it?

Let's guess:

1. Number of decks?
2. Gross tonnage?
3. Length in metres?
4. Top speed in knots?
5. Maximum passenger capacity?
6. Number of crew working the ship?
7. Number of water slides on board?
8. Cost in USD?