It's a long walk to a primitive site, but totally worth it. There's no real way of knowing if the sites are already taken, so be prepared for that. There's a fire pit, table and plenty of space for tents. If I go again, I'll bring a folding cart to bring more supplies. Can't complain for a free campsite.
Hal Scott Preserve has three campsites. Two of the sites require a hike in and are first come first serve. One is about two miles from the parking lot and the other is about 1/2 mile further. The third is a group campsite that must be reserved in advance, and you can drive to the site. All of the sites are free. The park has lots of trails to hike, and the sites are in nice shaded oak hammocks. The group site has a porta potty. The sites all have fire rings and two sites have pitcher pumps for water you can filter.