This sounds like a really, really cool concept, but with some rather significant regulatory, legal and tax implications. Have you consulted with specialists in these areas to determine the U.S. and international legality of the concept? Are there people using it already (and in what country)?
Good for you buddy. The ocean is more beautiful than the grandest of Silicon Valley office space. And startup CEOs usually don't get the time for walks down the beach, so enjoy it!
I'd go for a walk by the East River but I'm at work and I don't want to get MRSA from a radioactive sea creature.
Sitting/laying around will not advance your startup or your career.
My suggestion would be to map out the next six hours of your life. Just six hours. You can do that, surely. Then execute them. FLAWLESSLY, and exactly. When you're done, come back, and see what YC had to say. But whatever they say, you'll have a sense of real confidence that you can execute -- and that you don't need YC's permission to be a success.
Doesn't matter what it is -- hack some code, smile and dial, go for a run, read a book, whatever. But EXECUTE, and you'll feel better.
And to all who applied -- good luck! This isn't my first rodeo (in terms of YC or startups) and I can say for sure that a.) YC isn't right for every company at every stage and b.) there's a lot of ways to skin a cat, so keep on truckin!
At any rate, very cool!