There are high chances that your hair might damage, due to the salty water and the amount of sun exposure on your hair. These conditions may cause the color of your hair to fade. If you must go to the beach, I suggest you invest in a swim cap, or a bottle of cream rinse conditioner. Apply the conditioner before swimming and allow it to dry. Make sure you repeat this process as it rinses out, so as to maintain a protective barrier to the hair.