We are a family with 2 children (5 and 10 yrs), first timers to Yosemite. Plan to drive to Yosemite from San Francisco end September, stay overnight and next day before heading on to Grand Canyon. Any advice on what to do / where best to stay with kids would be great. Also assistance on driving route on to Grand Canyon, stopping overnight somewhere (suggestions for where?)on way down would be most appreciated. Would prefer to avoid Las Vegas. Many thanks.