My wife and I are planning a trip to NV, UT and CA in late Mach / early April. The plan is to fly to Vegas and out of Frisco. We would fly to Vegas, have a day or two there and then drive to (for example) Grand Canyon via Hoover Dam - Monument Valley - Lake Powell - Bryce Canyon - Zion NP - Vegas - Death Valley - Mammoth Lakes - Yosemite, Lake Tahoe and SF. Will Tioga pass be open? If not what route would be the best. How many days would you recommend if we don't want to drive more than 2 hours a day, except when passing the Death Valley.