Campsites (tents) in Cornwall?

Can you recommend a good basic camp site for myself & my 2 teenage kids for this summer please. Tents not caravans. It doesn't need to be flash, as long as there's a shower block & it's close-ish to a beach. We'll be travelling down by train with our bikes.

I have looked at some online but it's nice to get personal recommendations.

dont know any specifically in cornwall but i always recommend an excellent book "cool camping "(england)-they have really top campsites that generally aren't the noisy clubhouse type places-they have some special features e.g by the beach,fab countryside,off the beaten track etc-have been to a few sites in the book and havn't been dissapointed-have a good trip

If you are anywhere near Birmingham and the NEC, it's the Boating, Caravan and Camping Show on this week.
Lots of stands giving heaps of information about camp sites everywhere in this Country (and others).
There used to be a camp site near Hayle which we enjoyed using and the kids loved playing on the towans; easy access to St. Ives; you can go to Mousehole, Penzance and even across to the Isles of Scilly.
But many years ago now - it may no longer be there and I can't remember the name, I'm sorry, but the area was good.

if you are coming to newquay,click on to the newquay website and you will find loads!!!! newquay is surrounded with campsites with all amenities including entertainment.