Wonder if this works?How to do beachy waves in less than 5 minutes: Divide your hair into two parts. Braid then Twist each section and tie with a hair tie. Run your straighter/flat iron over both of the twist a few times. Untie twists, and you're done.
This beach wave tutorial leaves perfectly undone summer waves with just enough volume. This technique also creates volume in limp, straight hair. You can also use this method to smooth unruly natural waves. I tried this and it works great!