Park Farm near Bodium
http://www.parkfarmcamping.co.uk/" onclick="window.open(this.href);return false;
We went there on May bank holiday and it was brilliant. There were loads of vans and even a wedding party. I've never seen so many fires and parties going on. They encourage fires (they sell you the wood) and the facilities are very good. 20 minute walk along a river to the pub. Obviously, the vibe depends on who is there, but I should think this bank holiday should be good.
I don't know about the rest of you, but I give Caravan Club recommended sites a wide berth. We stayed at one in Norfolk a few months ago, 5 stars. The rules were so stupid, and the people so miserable, they were mainly in permanent caravans (their cars didn't even have tow bars) we left after two nights. For example, the nearest pub is two miles away, but they shut the gate at 9:00 pm and you can't get back on site!
Anyway, try this site, it's great.