We are a family of 8 (mum, dad, 6 kids aged 18 yrs - 2 yrs) planning a trip to USA next Summer. We want to spend 4 weeks and intend visiting English friends near Provo for some of it. Also maybe my husband's sister in Las Vegas... Is it viable to fly to California and travel up and over to Utah then down to Las Vegas and back to California?? We haven't yet booked flights and are flexible on where we fly to. As a teenager I flew to LA, drove through California, Oregon and Washington and onto Utah and loved it. We want to see some National Parks and would love recommendations on what we must see. Planning is in its infancy so all ideas are welcomed. Hope this isn't too vague!