Before you head out to ride your bike on the beach check the tide tables to see which way the tide is running. At high tide there is no hard packed beach to ride on, so you will be out of luck. You can find tide tables at www.hiltonhead.com And keep in mind that there is always a breeze on the beach. Riding into the wind is a lot more difficult that having the wind at your back. Enjoy your day of bike riding on the beach.