I live in a semi desesrt area. I do lots of walking. Try for 1 hour per day. So I walk lots and in the summer get lots of sun. I am not able to drink milk or ingest any dairy at all. But all the sun I get in the summer doesn't make me feel any better than in the winter. I guess everyone is a different and what works for one may or may not work for another. It would be so easy if that was all it took. Glad you have found what works for you.
Debbie