I'm not sure what you are looking for in this post, but I'll just share my experience and hope it will help. I went to the Big Island in August 2006. The great thing about Hawaii is that everything is beautiful! It really feels like you are walking in a postcard sometimes. Between the gorgeous valleys, volcano, and the beaches on the west coast, you will have plenty of great subjects.
Must Sees for a Photographer:
1) Hike Pololu Valley - part of a chain of 7 valleys on the NE side of the Big Island. The other famous valley is Waipio Valley. These valleys were featured in the movie "Waterworld" at the end of the film.
2) Explore West Coast beach. The most famous is Hapuna Beach, but there are several more secluded beaches all along the West Coast.
3) Mauna Kea Volcano - There is a trail where you can hike across an old volcano and pass through rainforest. You can also drive around old lava fields. Sometimes you can see live lava, but you have to be lucky and check with the Hawaii Volcano National Park's website for current viewings.
I would also recommend taking a boat/snorkeling tour. Depending on the time of year and your luck, you can see dolphins, sharks, and whales.
Unfortunately, all my photos are snapshots with a P&S because this was pre-SLR so I don't have anything great to share.