I just cannot recommend unprotected sun exposure.

There are 2 types of ultraviolet radiation (well, 3, but the UVC rays don't make it through out atmosphere): UVA and UVB.

Although UVA rays are not as powerful as UVB, they penetrate deeper into the skin. They are responsible for (1) wrinkling of the skin, (2) premature aging, and (3) CANCER.

UVB rays are shorter but stronger. They are the primary cause of (1) sunburn, (2) skin aging, and (3) CANCER.

Many people think that if they don't burn easily, they are better protected. Nope. UVA rays are still doing their damage as well. Most tanning salons up the UVA rays to make it less likely to burn. But the DAMAGE is still there.

Also, with higher altitude, the effects increase. (There's less atmosphere, so less natural protection.)

I'd go for the Vitamin D suppliment - or even better - foods high in Vitamin D.

With skin cancer #1 (or at least up there) in the ranks of cancers, I wouldn't play around with it at all...not if there was another way.

If you feel that you need the unprotected exposure, please keep it short!