Experiences with Depression and Vitamin D

I've never taken a supplement, but I believe we are all supposed to be exposed to the sun each day. Our bodies need the sun for vitamin D, and people seem to be so afraid of skin cancer they lather up in sunscreen every day, even in the winter (mostly on the face via a moisturizer) but the body needs some sun exposure. I'm lucky that I live in California, so can feasibly spend time in the sun a few times a week. I have found that getting out in the sun not only feels great on my skin (thus giving me vitamin d) but also gets me out of the house - both of these things have helped with my depression... (it's hard to site just 1 thing as the thing that "treated" my depression...after all, it's an on-going treatment, and multi-faceted at that!)