“Don’t wear white after Labor Day” has been advised seemingly forever by grandmothers and Fashionistas alike. Approaching the same sort of generational standard is my annual summer mantra to visitors in the Valley of the Sun – “Don’t sleep-in on vacation in Phoenix after Memorial Day.” I do not say this to be mean or cruel to our summer guests. Instead, once the pottery-kiln summer heat gets turned up, outdoor activities are turned down in the Sonoran Desert – and that includes guided Phoenix hiking tours & Phoenix mountain bike tours from my small mom and pop specialty shop, the Wild Bunch Desert Guides.