The South Campground in Zion is less popular than the Watchman Campground. There seemed to be less RV's in South, which for me is always a plus. I visited at the very beginning of October and if was still very warm, the temperature never seemed to drop at night. All I needed to sleep was a blanket, and not even my sleeping bag.

Upon arrival, the campground hosts chose a spot for me based on the current availability. The challenge with camping in the park is that as soon as spots are empty they are taken so there is a constant turn over and you just take what you can get. 

The sites themselves are not all the private but a conveniently located to bathrooms, water, and trash. Unfortunately I was placed right behind one of the bathrooms and the sites are such that people were walking through on their way to and from the bathrooms. 

There is a river that runs along one side of the campground and if you're really lucky, you may get one of those sites. There are a few spots where you can access the river to relax or for a quick dip. 

The Pa'rus trail runs through the campground which makes is easy to get to the Visitors Center and shuttle stop (roughly a 5 minute walk). The town of Springdale is not far away and easy to get to through the southern pedestrian entrance.

If you're looking for a hike and want to forego the shuttle lines and/or the crowds of Angles Landing (or maybe it just isn't your thing) I suggest the Watchman Trail that leaves from the Visitors Center.