Ayr Holiday Park is in St Ives, 10 minutes walk to the harbour. St Ives is a great place for kids with lovely beaches

Thanks for the info i will check out the website

Rather than give you one site 'cos it's a while since I did Cornwall
I use
http://www.chycor.co.uk/aaariv/accomhp.htm

to find campsites in Cornwall take a peek

We live in Cornwall..our kids like Polmanter in St Ives and Bude meadows, strangely enough in Bude!! Both have swimming pools which is the main plus for them, Polmanter has a bar and restuarant on site, big pitches and a pub nearby. 20 min walk into town and bus back up the hill!
Bude has no bar I don't think, but big pitches and not too far out of BUde...both have web site.

We camp a lot so if I can help then please pm me!

Whatever you do, dont go near Haven's Perran Sands.
Tents are crammed in so close together and it is set in ant infested sand dunes. Miles from the club, pool, shop and complex. Dangerous and badly lit at night, women/children do not feel safe to walk back from club area on their own. If you try to cross the dunes prepare for serious injury!
Toilets broken and full of faeces all over the walls and floor. Smell is disgusting and showers in the same area. Toilets only cleaned once per day so 99% of the time dirty and no loo roll.