7 councils as it is possible to enjoy the sun, without being afraid of a melanoma

For the person the sunlight is very important — from it help the organism develops vitamin D which strengthens immune system, reduces a stress and strengthens bones. At the same time surplus of the sun promotes acceleration of aging of skin and increases risk of developments a cancer of skin, or a melanoma. How it is possible to enjoy the sun so that both wolves were full, and sheep are whole? .