Take the day to decise you need much more time. For one day from LV, I would leave very early. The Dunes at sunrise are a must see. The dunes in the evening are a must see. In between, it is high sun. Go see something you don't need to photograph this trip. Drive uo to Scotty's. Take some side trips that are also must sees at sunrise or sunset. Use the day to plan your next visit.
The Race Course is unique. But early or late day, and 50+ miles of not so smooth road (RT).
Bad Water and Devil's Golf Course are on or very near main N-S road.
The charcoal kilns at Wild Rose are nice. Usually cool in the summer, and may be snowy in winter. Long drive from the Valley.
There is stuff all over the place. Take some time to enjoy it.
Unfortunately, DV is huge, and many of the photo opts are dawn and/or dusk. Maybe two locations a day tops. But plrnty to see if you are willing to leave your camera in the car.
Nearest town is Beatty. Food is mediocre at its best. See the Bull Frog gold mine and Ryolite is interesting. Then drive down Titus Canyon. Rough unpaved road, one way (toward DV). Can be driven in ordinary car with care.
Then there are many side roads. You can spend a half to several days on many of them.
Too much to see in a day, a week or a month. Different times of year are different.
Then the trip beack to LV after dark is long. MAkes a long day.