My husband and I want to take another trip west (we did it before but always in the heat of the summer) but can't decide which time of the year would be best for traveling. We both want to do it when kids are in school and campgrounds might be less crowded. We want to include in our trip visits to several National Parks such as Bandolier, in New Mexico, Bryce and Zion Canyon, Rocky Mountain National Park. Yellowstone and possibly Yosemite. Our thoughts are to leave Murphy, NC on or about May 2nd. The other option would be leaving sometime like September 1st. What are your thoughts about which time frame?