Mix a few drops of Lavender essential oil with coconut oil and apply to sunburned area 2-3 times a day. Both the Lavender EO and the coconut oil will soothe the skin and promote wonderful, natural healing.
My husband's back became sunburned recently, and I did this for him twice a day. His back never hurt and the skin did not peel. I also added in applying a Neem oil aloe gel. Neem oil is another super beneficial health and healing oil. My husband was amazed at how skin never hurt or peeled. His sunburned turned into a nice tan.
All that said, please avoid getting sunburned, as it increases the risks of getting skin cancer.