We went to Gwithian in August and it was ok.
Obviously heaving(beach,cafes and campsite) and there were quite a few knobs when we were staying(eg head of Boden family who asked the fish and chip van to cook his families fish in foil not batter,then smirked at us all in the queue,seemed to spend the whole time jogging round the site in bare feet-just because I guess).
It just seemed to be full of those upper middle class,entirely Boden/Jules clad families striding round with surfboards and teenage kids trying to show the world how right on they were. I have never seen so many immaculate campers in my life, it was quite intimidating
We did meet a couple of nice families though.
There was also a big gang of very loud kids that were quite nasty to the younger kids,spent most of the time racing round on bikes and seemed to enjoy torturing the guinea pigs.
There is nowhere for kids to play other than the central field which can get taken over however we bought a kite which they loved(kites very popular). The nearest s/market is Lidl which I was getting sick of eventually. There are others further afield but you need to be quite organised if you don't have ehu.
The curry van was fab,the pub is extortionate,site owner lovely.
Sorry to be slightly neg but it didn't quite do it for us. We may have been unlucky with the other campers though,it just had a funny feel iykwim.