I have camped there 2-3 times.  It has been a while now, but I believe there are 4 sites with tables and fire pits.  There is a pit toilet, but no water.  But if you drive a few miles North East there is a Illinois State Park, Cave in the Rock I think, and you can refill your water jugs/bladders there by the showers/bathrooms, and there are garbage dumsters.  The Cave off the Ohio River is definitely worth seeing, and free, so why not.

A short walk from the campground is Tower Rock that was an old CCC path and over look of the Ohio River.  Last time I was there it is a bit of a pain to find the old path, but basically from the boat landing go UP... follow the terrain and you will find it.  It is a rock cliff that is, I don't know 100 feet above the river.  In my opinion it is worth a look.

There is a Ferry that goes between Illinois and Kentucky right by the park too.  Free.  I went over once, never been on a Ferry.. and the gas tax in Kentucky is cheaper...