John - great reply! Thanks so much. You've given me a starting point for my adventure.
To tell you the truth, I'm most nervous about exposure issues. Bright sun, ocean reflections, darker rocks, etc. I'll be using a d70 and I understand that I can take two pictures and combine them in photoshop. But I'll be shooting and learning on the fly, and I'm sure I'll make some mistakes. I'm bringing a Mamiya 6 also, which I need to be more careful with. If I can come away with just a few wonderful pictures, though, I'll be happy.