I would be grateful for any advice: my family -my husband and myself and our 9 children (ages 15-2) are driving an RV from Los Angeles area to Yellowstone Nat'l Park. We have 10 days. We would like to head straight to Yellowstone for about 4 days and on way home, visit national parks in Utah, Grand Canyon, and Hoover Dam. We would appreciate any advice on what to see in Yellowstone or other places. Thank you!