A steady climb with tight switchbacks, broken up with occasional rolling sections.”
— Bracken Christensen
As of this writing, this trail is fairly new and isn't on the park map they give you at the ranger station. Look for the trailhead on the east side of the road shortly south of the Sunflower trailhead. Head up and wind through large boulders, working your way up to the top of the canyon. There are some really nice views along the way and from the top.
At the top, there's a trail that goes left, which dead ends shortly at an overlook. There's also a trail that forks right, and connects to a dirt road in a few hundred feet.
Drop back down from whence you came. The combination of loose trail, tight switchbacks and more climbing than you may expect, make the way back challenging. The ride is actually considered to be intermediate, but it's difficult relative to the rest of the area.