Sunny and Cold

What to do when it's sunny but cold?  You know the snow's gonna suck for the most part, but the sun feels so good, especially coming out of winter when so many people suffer from seasonal affective disorder, which I never believed was true until this January.  What is it, Vitamin A or E that the sun gives you?  It feels really good and you can tell that your body takes in the rays and converts them into happiness.