The Oasis of the Seas is the biggest cruise liner ever built. It weighs the same as five Titanics, and cost more than £800m to build. Its first voyage is in January 2010.
It's got room for more than 6,000 passengers but if they forgot to pack anything they can always buy it in the shopping mall.
There's lots of activities to do like this big climbing wall, which is almost as tall as the 18 decks which make up the ship.
And once you're tired of climbing up, what better way to get down than on this zipwire!
There's more extreme sport action on two surfing simulators, so you can catch some waves without ever going in the sea!
If that's all a bit too energetic, you could just hang out by one of the four main swimming pools.
Or why not enjoy a relaxing game of mini golf while enjoying the ocean views.
There's a park on deck with 12,000 live trees and plants in it, as well as 4,100 toilets!
If you get thirsty on the way back to your room, you could always get a drink in this floating lift which has its own bar!
Even a basic room costs around £700 for a week-long stay, but you'll have to pay a lot more for these luxury apartments which look more like proper flats and cost thousands.