#iwasthere and the trip was a nightmare! I joined a friend who was travelling with two of her friends. The latter had not researched or planned their visit. After landing in Las Vegas, they took in [smaller] national parks to the east before turning back for Yosemite which takes three hours to traverse by car. They didn't realize that the National Park Service's operations vary by location. Suffice to say, tramping several miles in the night wearing dark [prescription] glasses was no fun. PLAN AHEAD!