I found myself in Malibu Beach last year for a few days and wanted to shoot the coastline. There was one particular area of Malibu Beach that I knew had some caves to explore when the tide was out. I grabbed the camera and wore some water shoes to get the shot!
The cave photo proved to be a bit of a challenge. The waves would come up high enough to hit my mid-calf with every wave. At first I tried to run in and out between the waves to get the shot and minimize how wet I got (besides the shoes, I was dressed inappropriately as I'd just come from work). That didn't work - my timing was bad and I ended up with foot prints in the shot. After a bit of trial and error, I decided to just roll the pants up as high as they'd go and hope the dry cleaner wouldn't be too mad at me!
It worked - I got several shots, but selected this one. I liked the seagull in the background and it had nice detail in the cave shadow.
Shot with the Nikon D7000 and edited with Adobe Photoshop. Black and White conversion done with Nik Silver Efex Pro 2.