I have done Utah in July, down low its warm, be there early in the am. and up in the mountains during the hot part of the day, stay hydrated, and the cooling vest sounds like the trick, the next time I ride west, I will have one. Lots of sun screen, lip balm with sunblock, and belive it or not a pair of lose fitting bib overall are great, a Tshirt under them and open the "vents" on the side, lots of air flow. Besides you might meet some farmers daughter..LOL