We love Nethergong :-)
We live about 4 miles from the site and treat it as a weekend getaway without the hassle of a long drive. It seems we are not alone as a lot of other campers their are local. You can camp in the woods near the facilities or further out by the fishing lake or frog pond, we set up by the fruit trees last time and were treated to a midnight flurry of owl calling.
Firepits are allowed, Jed delivers them to your tent with plenty of kindling and logs for the evening, the small shop stocks enough basics to get by and they have a veg box scheme so you can take your Sunday roast veg home with you :-) Be aware, there isn't a large supermarket without heading off towards Canterbury.
Only downside for us are the portaloos, which by their very nature are unpleasant things so worth ambling across to the main block unless desperate!