I believe eating foods high in vit A is supposed to help. I say "I believe" because I'm hoping I'm remebering correctly (I'm wiped and my brain was ready for bed a while ago)- eat lots of liver for sure. Don't forget to stay hydrated- you'll burn so much more easily if you're dehydrated. Also, St. John's Wort oil is great sunburn protection that works better the more you use it.
*Tried to add this under the original question but could for some reason:
I mention SJW oil below but I wanted to chime in here and share my plans for this summer. I'm fair skinned as well, freckeled even. I've used SJW successfully for the past 2 years. This year I plan to infuse coconut oil with SJW AND rosemary(also protective against radiation because it contains a compund called rosmarinic(?) acid). To do this I plan on using fresh herb (stuff a jar with the fresh SJW flowering tops and fresh rosemary, then fill it with just melted coconut oil, let sit somewhere warm enough to kep it liquid for 3-6 weeks) BUT WHILE I'm waiting for that batch, I'll just make some rosemary coconut oil that way and add some already prepared SJW oil purchased form the store. Sorry for the long, maybe useless to you, explanation. :P