Well, the Earth is over 70 percent water. It seems that expanding our habitable space to exist on a marine environment is more feasible than, say, building a colony in outer space.

Grumpy travelers' concerns aside, it could be a really neat concept akin to a destination in and on its own. Like an EPCOT center, but factoring in the economic, environmental and social issues of building a floating city. An engineer's dream . . ..