Hope you enjoy Thailand!

And skin cancer...not as big of an issue with the sun as people make it out to be. While part of the UV spectrum does cause skin cancer, getting out in the sun causes your body to produce vitamin D to fight it off. The results in a sort of balancing act, such that those who have exposure to the sun through normal glass actually have a higher incidence of cancer than those who go out in it regularly. So, just make sure you use UV blocking sun screen to make sure you don't burn, and you'll be fine!