Arch Rock is a short, not even half-mile there-and-back trail that mostly features a bunch of cool, prehistoric-looking rocks. Walking around here totally made me feel like I was on the set of The Flintstones or something. The trail starts at White Tank campground and the main feature is a cool, arch-shaped rock. I wasn't brave enough to climb onto it so here is a picture of my fiancé being a goof.
Cholla Cactus Garden
You can see chollas all over the park, but nowhere so magnificent at the Cholla Cactus Garden. The coolest time to see them is when the sun is lower in the sky, because it kind of illuminates them and gives them a nice glow. The trail isn't too exciting but it's a nice place to take some pictures. In the spring, you do have to worry about bees pollinating.
Wall Street Mill - Wonderland of Rocks Ruins
We actually walked around in circles before finding this place, and barely got there before it got dark. It's right off of the Wall Street Mill trail, so we parked at the Barker Dam lot. The instructions I found online on how to get there said it was only about a-tenth of the way into the trail, which is why I kept thinking we had passed it. But we had started on the trail from the paved parking lot. There's actually a dirt overfill lot that is much closer to the ruins. And if you start on the Wall Street Mill trail from that parking lot, you only have to walk a few minutes before seeing a trail off to the left that leads to the ruins. The trail is quite wide and well-traversed so you can't really miss it. And you can even see the ruins from the main trail. Not really sure what this building used to be (someone told us it was possibly an old dairy house), but the ruins are pretty cool!