Here is a quick Camera Flash built with Buena Effect Essentials. You can build a camera flash pretty easily by keyframing a solid, but I like the way that this flash really highlights the brighter areas, like the sample in the image to the left. That is one frame after the hottest part of the flash.
Download preset (AE 7)
Yeah… why would you need to use a flash at the beach…. I know I know… suspension of disbelief, okay… (Photo courtesy of iStockPhoto.com)