Never come to this forum to get talked out of Anything bike-related.

Corollary: If you wonder aloud here if you can do something you WILL be told that you can, should, and that we want a full report when you are done. (I know...)

Back to the problem at hand. If you are really worried about your sun/heat tolerance, talk to your physician. More than likely you'll be told to use sunscreen, drink lots and have fun. But it's nice to have a doc's input sometimes.