I'd never heard of the Trinity River Authority before. It's not a name that jumps out when one thinks of camping. But in Texas, perhaps it should be. The private company built dams and reservoirs all over the state and funds their operations through water sales and permit use.
Lake Livingston is one such project, the 3rd largest lake in Texas and the largest one constructed for drinking water. The company is clearly very serious about maintaining beautiful and professionally run grounds. The sites are generally well-monitored, spaced nicely, and situated with great water views if you choose one in that area (see my map photo). The park does not allow day use in camping areas nor day entry at all on weekends, keeping the entire park reserved for paid RV guests.
I grew up around Lake Grapevine, another TRA project though I didn't know it as a kid. But I've never woken up to find a sunrise over a lake right outside my bedroom window. That's pretty special.
Like another reviewer mentioned, I did see a dog running loose and investigating people's campgrounds.
If you're in Texas and want peace, quiet, total darkness (there are no lights of any kind in the camping area), and lower temps than Houston, come check out Wolf Creek Park.