Shieshedo makes a 35 block that looks like foundation and goes on like foundation. My lil bro uses it in the water when he goes surfing so he doesnt burn. It leaves his skin really pale even after going in the sun for long periods of time in the hot, hawaii sun while surfing. so I'm sure it would help keep your skin perfectly pale...
Also, maybe invest in a really cool floppy hat and slather on the 45 block. Try the gel block stuff with UVA and UVB protection.
To get rid of your current tan, exfoliate daily, it encourages new cell growth (all that a tan is, is a layer of skin that has darkened and has yet to slough off) and will help get rid of the old cells. Don't overdo it though- it can make your skin red and scaly. And MOISTURIZE!
I think the most important thing is sunscreen. and more sunscreen.