I started law school last summer and thus went from spending 20 to 40 hours per week outside to only 20 to 40 minutes a week. During my between-term break, I needed to catch up on some yardwork. I completely forgot to put sunscreen on the first day and, after about eight hours outside, my lily white skin had turned tomato red.
My wife thought I would be in misery, but I remembered a tip from my mom that has been part of our family lore for generations: Use vinegar to season a tan.
After getting out of the shower, I applied some vinegar (any type works, but apple cider seems to be the best) liberally to all the affected areas. The next morning I had a couple of pink spots left on my face, but everywhere else was tanned as if I had spent a careful week with sunblock. I was in no pain whatsoever.
Though I would never recommend forgetting the sunblock, vinegar is an incredible first-aid remedy for dealing with a sunburn.