Izinyo, I would think that it's best that you NOT see this special ocean so often in real life. The fact that you only see it in dreams just reinforces the idea of it being a dreamsign.

I have a dreamsign that I have never seen in real life (tornado), and it is this fact that I think helped me realize that I was dreaming.

It sounds like you're very close to recognizing your dreamsign within a dream. You just need practice - I know, sounds simple.

Try this:

1) Give yourself a goal of something to do next time you see any large body of water. Like jump into it and swim across, or go down to the bottom as far as you can go. This may give you the oportunity (within the dream) to have something strange happen -like breathe underwater and therefore become lucid. If you're in waking life, imagine youreself doing these things as if it were a dream.

2) Get either some video with ocean scenes, or some CDs with ocean sounds and watch or listen to them before bed. I got a bunch of footage of tornados that I'll someday edit together and make myself a nice tornado reel to watch before sleep.