Word of advice, if you drive to The Racetrack from the Ubehebe side (from the east) stop at the second parking area (southern parking area). It's worth the 1/2 mile hike to get toward the back (southeast end of the playa) where the mountain side and dry lake bed meets. That's where you will find many mysterious rocks. The north end of the playa is almost devoid of the moving rocks.
Welp, my "Four Days in Death Valley" just became "Seven Days in Death Valley in April".
I ended up going back for Death Valley Part Deuce. I was a passenger/tour guide for some of my friends. So I got to go back and get Eureka Dunes, Steele Pass, Saline Valley, and Lippencott covered.
Additional photos to come soon.