I don't think there should be a visible shore. I can't see across the Pacific, why can you see past the Sea of Ghosts? That's a really small ocean...
As Jiubs map shows you, the sea of ghosts
is a tiny expanse of water. Not quite the pacific ocean, more like the http://de.academic.ru/pictures/dewiki/69/EnglishChannel.jpg. And, as I already mentioned, France is clearly visible on a clear day from the shores of England.
You can't drown when you're levitating, or if they don't have daily fatigue you'll never be exhausted. http://www.youtube.com/watch?v=qvciIVcn33c&feature=related
Fair point well made
Megashark can deal with the levitators/olympic swimmers.