The park's website has this to say about the trail:
Smith Spring Trail
Begin this hike at the trailhead sign. Look for birds, mule deer, and elk as you walk this loop trail to the shady oasis of Smith Spring. Take a break here and enjoy the gurgling sounds of the tiny waterfall before continuing around to sunny Manzanita Spring. Scars from wildland fires of 1990 and 1993 are evident along the trail. The trail is rated moderate, with a round-trip distance of 2.3 miles. Allow one to two hours.
For information about other hikes in the region, visit our hiking page: www.texasmountaintrail.com/hike