So Much to Discover: Discovery Trail
Discovery Trail may not look like much at first, but you definitely shouldn't miss it. Discovery Trail connects the Skull Rock and Spilt Rock loop trails at Face Rock so you can easily knock out three trails in one go and it's only 0.7 miles so it doesn't take much extra time.
Much like Split Rock, Face Rock and Skull Rock were given those names because well they look like the profile of a face and a skull if you look at them from the right angles. I think if I spent a ton of time in that desert sun I'd start to see faces in the rocks too.
You can also access Skull Rock from the road so it tends to get a bit crowded with families and selfie takers. I'd recommend visiting it earlier in the day before the crowds converge.