+1 for Pentewan, nr St Austell – I grew up in Cornwall and we always went on school camp there. Can’t remember much but there seemed to be lots of activities!
But, if I was camping in Cornwall now, with kids, I’m not really sure where I’d go. A lot of it is quite spread out. If you liked Newquay, then Perranporth is worth a shout – nice big beach and you could pop to Newquay for a day trip if you wanted to.
I’d personally go for the north Devon coast, as someone has previously mentioned (thinking Barnstaple to be in Cornwall – it ain’t :lol:).
Woolacombe is a great beach for kids and adults, and there are so many places to visit in the vicinity. There’s a nice caravan/camping park in Croyde (Croyde is an awesome place) – Ruda Bay. And if you have a car you could venture to Exmoor, Lynmouth, Illfracombe, Westward Ho!, Clovelly – all those kind of places which are really nearby.