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yes Im leaning towards 7D, have you been there?
Yes, twice, but both pre-DSLR, so I'm imagining what I would take if/when I go back. It's a wonderful place. Limited numbers of visitors, very few vehicles, so relaxed that no one locks up (at least, they didn't when I was last there).
If you can, go on the guided walk (climb) of Mt Gower. It is spectacular, and if the muttonbirds are nesting, you will have some great photo opportunites.
The snorkelling (and diving) is excellent. Consider taking a waterproof camera (even a waterproof disposable, if they still make them) for some different shots.