I've got that Anglo-Celtic phosphorescent white skin. I practically glow in the dark. I can get a sunburn in half an hour at noon in the summer. In my family we joke that in full sunlight our skin starts to bubble and smoke like Christopher Lee at the end of Dracula.
So, I wear sunblock. SPF30 on the arms and legs, and 50 on the neck, ears, and face. I used to slather it into my balding pate, too, but I've gone with a skull cap recently. I can ride for 3 sweaty hours or more without burning in high summer that way.
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"Don't take life so serious-it ain't nohow permanent."
"Everybody's gotta be somewhere." - Eccles