I stopped at Highway 9 Landing while driving from Taos, NM to Nashville, TN. Just a little ways off the highway it was a nice place to spend the night right on Oklahoma's biggest lake (at least the biggest that's entirely within the state of OK). Midweek in mid-October the campground was all but deserted. The only sounds I could hear were the roadway across the lake, birds, and lapping water.
In the off season the bathrooms were sort of clean-ish. Sites have picnic tables and grills and some have good flat spots for tents but I got the feeling that it was a campground more geared to RV and van camping.
There's a marina on one side of the campground and I can imagine that in the summer there's lots of activity on the lake making this a very lively campground. It was a fine campground just not my cup of tea. (Also the sunset was incredible)
Excellent place to camp! Already planned next trip