[blparent] OT sort of? Natural sun screen?

[Pipi]

Hey y'all,
Sorry if this is too off topic, but it does pertain to Savannah and myself.
Does anyone have any experience with all natural sun screens? Can anyone give me advice on ones that actually work? 
I received my 3rd sun burn of the year today and it's still March. I'm not going to make it through the spring let alone the summer this way. I have tried several brands of sun screen and I break out from everything I try. I gave up on trying. I don't know what it is that I'm allergic to, but in the past the burns or just staying out of the sun was better than the rashes and such.
I'm going to San Diego for a week and want to be able to enjoy myself this summer. I have to find something to protect my skin from the sun that won't cause problems in the process.
Thanks for reading my ramblings and any help would be so greatly appreciated.
Pipi