If you're getting married on or near a beach, then lucky you! You must take full advantage and get those all-important beach shots. Don't worry about sand on your dress, it will brush off, and any wind or breeze will only add drama to the image. You don't have to touch the sand; you can do what you're comfortable with. You can position yourself on the sidewalk or pier or even balance on some rocks. My only advice would be for the bride not to do this in heels. A nice pair of flats on the beach will make it all the more comfortable and enjoyable. Remember, the most important thing is to have fun in your photos.