Sunburn is a natural process though you can avoid it if you try. Continuous exposure to sun is harmful for skin though natural sunlight is also necessary for the health of the bone as natural sunlight is the best source of vitamin D. So, expose your body to direct sun only in the early morning and at the time of sunset when the presence of ultraviolet rays in the sun is comparatively less.
Papaya works well on burnt skin. Everyday use of papaya helps to cure wrinkles caused by sun burn. Use it every day at least twice daily and get soft and smooth skin.