I'd have to disagree with the idea that the sun will ruin a tattoo. I mean, look at my friend in my pic. He NEVER wears a shirt, is covered in tattoos, lives in the hot Miami sun and IS a tattoo artist lol. His tats look great and the colors are very vibrant. The pic doesn't do them justice.
My tattoos are also constantly exposed to sun but haven't faded at all. Of course, I'm no dermatologist or tattoo artist so what do I know?