You won't see a lot of supervision here, but the park is well-maintained.  There's not a lot of official information available (like many county parks).

Pit toilets/shelter/playground near the entrance.

Two boat launches.

Variable availability for firewood; the Cenex on the west end of Argyle reliably sells it if there isn't any at the park.

Site availability is first-come, first served (no reservations).

Sites have picnic tables (in season) and fire pits.

Sites are generally well marked, but some can be difficult to find.

I believe that current campsite costs are $5/weekday night and $10/weekend night.

Some events occur here: an annual Rendezvous (on May 3-8 in 2022, there's a facebook page for more information), a blackpowder shoot on May 15, etc.  If you're planning on staying, it'd be a good idea to do a search first to see if a few hundred other people are going to be sharing the park with you.