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Based on the touched up pictures, does anyone have an idea what species of shark that might be. To me it looks too thick around the middle to be reef shark or a tiger shark. If it is a reef shark or a tiger shark, might it be a pregnant female?
The shape of the nose definitely looks like a great white or mako (pointy) while a tiger has the more squarish "shovel" nose. If this is Hawaii, it looks to be the leeward coast of somewhere (see how flat the water is?) - Maui is my guess. Of course, those are just my theories. We'll never know unless we speak to the photographer and/or kayaker (or the shark for that matter!).