There's a 29 Palms and a 49 Palms oasis? And 49 Palms oasis is in the Town of 29 Palms? Ay yay yay.... It's going to be hard keeping that straight in my brain, not to mention this forum.
So we're not talking Oasis of Mara (aka 29 palms), it sounds like. We're talking that backcountry hike, not a nature trail at all.
Wow. From the profile graphic on the quoted post, the elevation gain is 200 feet back out of the canyon and then another 200, after 200 plus 200 on the way in. That's a lotta climbing, especially that heat. Then there's all that downhill, likely with rubble-y stuff underfoot: recipe for a skid and injury. He'd better have been wearing hiking boots....
Now that I've sorted out we're talking 49 Palms, here are a bunch more photos:
Fortynine Palms Oasis in Joshua Tree National Park
Woah, this link has the coolest graphic. Run your mouse over the profile and it shows the corresponding trail point on the contour map.
But wait a sec..... This profile is different from the link quoted above, because it only shows one uphill and downhill in either direction, and not 2.
Another note from these photos in my link... that trail is trouble: scree under foot, lots of side trails, blank spots created by runoff, boulders and rocks underfoot. So easy to get lost or hurt.