You defend your skin from UV rays and it needs protection from sea salt, too. Opt for a sunscreen that's rich in moisturising and nourishing ingredients. A suntan oil is best, as it will not only moisturise your skin but also increase the lipid levels. Salt will then literally slide off, leaving the protective barrier intact. Once you're out of the sea, hop in the shower and wash off the salty residue. If there are no showers on the beach, mist or splash your face with some fresh or mineral water to remove surface salt and soothe your skin.