There are multiple hiking trails in the park:
The Bird Watching Trail is a .7 mile loop that takes hikers to the lake, and requires good eyesight, good hearing, and a bit of patience, but even without the birds, it is a beautiful walk.
The Nature Trail is a two mile loop with scenic views of the lake, and occasional signs about the fauna and flora that you may see as you walk. Be on the lookout for beavers, otters, and bald eagles by the water, and be especially careful where you walk/sit, as timber rattlesnake sightings are uncommon.
The Scenic Loop is a .4 mile trail that takes the hiker to the lake and past beautiful scenery for the return to the trailhead.
The Dockery Trail is a 5.3 mile trail whose southern trailhead is just outside the park entrance, accessible from the north at various points near where it converges with the Scenic Loop and the Nature Trail. Word from the ranger station is that starting from the north is the way to go. This is a fairly strenuous walk in some areas, but there are multiple scenic views, and a small picnic area at the loop at the end of the trail. Note that the walk is 5.3 miles one way, so be prepared!
The Big Brown Creek Trail, while referenced on maps and signs, appears to be closed indefinitely. This three mile, one-way trail, with a loop at one end, leads to primitive camping sites.
The park's trails are open to hikers, bicyclists, and equestrians except where noted. There are two boat ramps, two fishing piers (and fish cleaning stations), a swimming area with a small beach and playground, picnic areas (with grills and picnic tables), kayak rentals, and three camping areas with over 130 sites. Some of the campsites accommodate RVs with hookups, while others are a bit more primitive, and there are plenty of restrooms. The park can handle groups with a large dining hall near the South Boat Ramp.
The Chancellor Union Cemetery, dating to the 1850s, is reachable on the park's original access road. Approaching 100 burials, this Historic Texas Cemetery is part of a tract of land donated by early pioneers, Reuben and Mary Chancellor, and they are buried here with many of their descendants.