Natural sunscreen

I'm looking for a natural alternative to chemical/industrial suncreen lotions which have too many harmful ingredients from my point of view.
I've seen mentions of coconut oil, sesame oil and shea oil/butter to protect the skin from the sun.

Having a pretty fair skin, it is easy for me to get a sunburn under the sun of California.

Does any of you have a recipe to share with natural oils and/or butter to protect the skin from sunburn and harmful UVs and keep it moisturized?
I don't really care too much about the EO/FO "smell good" aspect of it, let's keep it simple ...

Thanks for your precious help,
Alchemille

http://www.sharingsofwomen.com/personel-care/928-natural-sunscreen.html