If hiking is your primary focus, you might visit
Texas Hiking. As the name indicates, this site is dedicated to hiking in Texas. You can use the "Find a Hike" feature to locate hikes throughout the state by regions, counties, length, and other criteria.
Of the places referred to you in this thread, I would recommend Lost Maples above the others. The terrain is challenging and beautiful. Lots of people visit this park when the maples are in color, but few venture very far from the trailhead. You can enjoy some solitude here.
In the area is Hill Country State Natural Area. It has about 40 miles of trails, and very few people visit this park. As I recall, it is a favorite with our Wild Texas host, Shannon.
One place I did not see mentioned in this thread is Dinosaur Valley near Glen Rose. My avatar shows me crossing the Paluxy River in that park. It has some good trails, but the park is a busy one. It is not too far from your home. I would urge you to check it.
Another nearby park is Lake Mineral Wells State Park. There's really nothing special about most of the trails there, but the foot trail near the trailhead of the Cross Timbers trail (not to be confused with the Cross Timbers Trail near Lake Texhoma) is interesting and scenic.
Enjoy.