Most campground websites make guests do the work. They squint at a PDF map, call to ask what's open, leave a voicemail, and wait. Some give up and book the park down the road that let them do it online at ten o'clock at night.
We build campground websites where a guest picks their dates, sees which sites are open on your actual map, taps the one they want, and sends the reservation. You get the request with everything you need, and you stay in control of your park.
The pictures below are from Cedar Creek, the demo campground we built to show how it works. We've also tested the map on a real 87-site resort map, to prove it works for a park that size.