I was there about ten years ago, and the most photogenic part of the trip was the kayak tour around the little pointy islands in the adjacent bay (Phang Nga Bay) - incredibly photogenic! There are probably regular big-boat tours too, if you prefer that. If you have a car, there is also a park, Sa Nang Manora Forest Park, on the mainland not far from Phuket Island that has some very photogenic jungle. (If you want to see examples, look at my web site [URL in my signature] under "East Asia - Thailand", and look for "Phang Nga" and "Phang Nga Bay". However, those were taken with my old quite-out-of-alignment film-camera lens, so the image quality wasn't the greatest.)
Lisa