Oh we loooved our stay at Big Gums, it was our favourite stop out of all 9 places we visited across South Australia! It was peaceful, a beautiful rural piece of land where sheep roamed and Gum trees protected us from the heat. The campsite was huuuuge, you have complete choice over where to set up, and if others come (which they did)...you still have masses of space between you so it's like you're still in your own slice of heaven (the others were so far away we literally couldn't hear them at all). There is a portaloo there, like the type from a construction site, which is handy but as we were self contained we didn't need to use it.
The best bit for us, aside from whats mentioned above, is that it was just 10 minutes from Victor harbour, so we got the peaceful bush setting but also the beautiful ocean and loads to see and do really close by.
If we ever head this way again, we would 100% stop by at this site.