To whet your appetite and keep your writing fingers limber, take a good look at the photo, or let a prompt settle in your mind. Set a timer for whatever a reasonable amount of time is for you, be that five, fifteen, or thirty minutes. Then start writing.
Tell the story of a surfer who is always searching for the ultimate wave.
Write about your early experiences with the ocean or other body of water.
Write an article about the last place you visited. How can people make the most of their time in that locale?