Want this "starburst effect" in your shots? The key is making your aperture small. To do that you must select a relatively high f-stop number. In this photo, taken early on the beach at Destin, FL, the aperture is set at f/22. Try using the "aperture priority" setting in which you set the aperture and the camera changes the shutter speed accordingly.
The problem with that is you may not want the exposure selected by the firmware in the camera, which is programmed by someone in Tokyo you've never met.
A little "trial and error" shooting will get you the shot you want. You'll probably get the best result by developing your shot to decrease the highlights a bit and pull up some detail from the shadows.