Found this thread today, and was hoping for some updated info on this tragedy beyond what was reported by the media in the the first few days. I have nothing new to add to the lessons learned discussions here, but can add some first hand experience/perspectives from my multiple trips to Gold Valley, including Willow Springs.
I've been down in Gold Valley 3-4 times on my dual sport motorcycle, just because it looked like an interesting place to check out on the map. It was a very fun area of two-track roads to ride, which is why I kept returning. In late March, just a few weeks before this happened, I took my wife there in my 4x4 van, along with a friend in a Toyota 4runner.
Having now done it on a motorcycle and a 4x4 van, I can tell you Gold Valley is pretty remote. It is an in-and-out trip so there is no thru traffic passing by on their way to someplace else. I've never seen another vehicle while in there but I can tell by the tracks that there are occasional visitors. Not too rugged for a SUV with decent tires and clearance, but their Subaru was out of its element.
Gold Valley has a trail description in the Death Valley SUV Trails book by Roger Mitchell (2006). I mention this because it calls out Willow Springs as having a must-do half mile hike down the canyon to pools of water pushed to the surface by the bedrock and being the best place in the park to see Desert Bighorn Sheep. I wonder if this was the attraction for them to visit Gold Valley in the first place.
We were hoping to find a worthwhile camp spot in Gold Valley and headed towards Willow Springs since I knew there was a large flat area at the end of the road. We did camp in that area and did the "must-do hike" the next morning. That half mile hike has very little elevation drop and alternates between impenetrable thickets of willows that would fill the canyon from side to side and open areas of rubble and some bedrock. There were faint trails to bypass the willows thickets on the hillsides. Travel was relatively easy but there was no payoff. We didn't find any pools of water at the surface. Yes, there may have been some water in the midst of the willows but we didn't look that hard. At about the half mile mark the canyon walls got markedly steeper and I now had to scramble up a hundred feet and traverse a bit to see beyond that thicket. I could see that the canyon was beginning to drop and there were even steeper slopes and cliffs ahead before the canyon turned west out of my view. To continue on (I didn't) would have required traversing very steep slopes of sometimes loose and often sharp rocks with more and more exposure. Climbing down to the canyon bottom again didn't seem like it would gain you easier passage because further willow thickets would require you to reclimb to regain the altitude you just gave up.
Although hiking 22-25 miles on the known dirt roads back to pavement sounds daunting, it was only 12 miles max out to Greenwater Valley Rd (aka Death Valley Wash Rd) which is a wide, well graded and easy dirt road which does have some traffic each day (speaking from having driven on GWV Rd at least a dozen times). Hiking 12 miles out on Gold Valley Rd would have taken less energy, both physical and mental, and could have been done at night if heat were an issue.
--Joe
P.S. I've been carrying a SPOT, but now an InReach, on my adventures for at least 10 years.