Hello Cedrictonk,
As many have said, there is no exact answer to your question. If your beach scene looks, and more importantly feels, right with no lighting done, then go with it. If there are cosmetic issues, or the light is not in the right place, then we must often "light" it. I, personally, try to do as little as possible with respect to lighting day exteriors, and so it then becomes more about anti-lighting. By anti-lighting, I mean the literal taking away, be it completely, or with a softener (silk, full grid, etc.) of unwanted light, and then beginning anew. This can be most time consuming, if it is even possible, and so might not even be an option. The trick for me then, as I stated, is to try to schedule the shoot so that you are looking in the right directions, based on sun, at the right times for what looks best for your dramatic needs...
Once again, really try to analyze your story, and emotional and dramatic content when determining this. You may be trying to make something look beautiful and romantic, which should be ugly and harsh to be in sync with your story...