Do we really need to go out in the sun in small doses in order to get Vitamin D?
As I live and work in Florida, I always tell my patients that they don't even have to think about it-- they're getting plenty of incidental sun exposure just by living in Florida.
Sun comes through the windshield of your car, through the windows of your house, and you get plenty of exposure just by walking the dog, walking from a parking lot to a building, or going out of the house to get the newspaper or mail.
There is no need to purposely not use sunscreen in order to get more Vitamin D. In this way, you are doing something bad in order to do something good. If you really are Vitamin D deficient, then it is much safer and more efficient to take Vitamin D supplements orally.