That's a very interesting paper! It has long been my belief that sunshine is good for you, and so long as you avoid an outright suburn, basically the more the better. Even with respect to cancer alone, from what I've seen in the literature over recent decades it seems undeniable that the reduced risk from various common cancers like prostate and breast cancer far outweighs the possible increased danger from skin cancer since melanoma is comparatatively rare and carcinoma not very dangerous; but mostly this is ascribed to Vitamin D and then taken as a recommendation for Vitamin D supplementation rather than increasing sun exposure. The sun, the primary source of life's energy on earth, remains mostly vilified by medical science.