I've heard of this trail for quite a while, so I'm glad I finally got around to hiking it. Having said that, though, I doubt I'll return. I just didn't find the trail to be scenic. I understand, though, that the spring wildflower display is impressive. If I were to hike it again, I would do so at that time.
The hike itself wasn't really bad. The wife and I had the trail to ourselves. We did not meet a single person the entire hike. However, about a quarter mile or so from the trailhead, we heard a loud humming, which turned out to be a well head pumping. The trail passes right next to it, and you can hear it for at least a quarter of the mile at the spot where you get your first glimpse of the lake. Later, somewhere along the west route around Flag Pond, we heard more oil well activity.
I was glad much of the trail we hiked was in the shade, as the day was hot. Two old foggies in their mid to late fifties really shouldn't be wandering around the Texas countryside in late June during the middle of the day. Also, much of the first 2 miles of the trail is very sandy, which makes walking difficult.
We looped the Flag Pond clockwise. I was surprised to find some cabins overlooking the pond (just outside the park fenceline), but I was disappointed the pond and much of the lake were covered by lily pads and other growth. The pond had very little water. If you do hike this way, be sure to stop at the wildlife viewing area near the northwest section of the pond. It is a good rest spot; however, there wasn't much wildlife to view.
We spotted one deer at the north end of Flag Pond and one armadillo early in the hike. The east side of Flag Pond is almost completely exposed to the sun, though the walking is easy on a roadbed. Most of the hike is fairly level with occasional inclines the first 2 miles from the Nails Creek trailhead.
My recommendation would be to save this trail for spring time when the wildflowers are in bloom.