Longleat Centre Parcs Tips & Advice

Ok so booked Longleat Centre Parcs last minute as we're in need of some relaxation and there is no chance of getting abroad this summer :-(

Been to Sherwood before but looking for advice and tips for Longleat as we don't want to spend too much.

I've already told my 9yr old son we won't be booking lots of activities, almost impossible last minute anyway:(, but we can do a couple of reasonable priced things.

We're planning on taking our own bikes, food and making full use of the swimming pool.:)

Are there any green areas where we could kick a fooball around or fly a kite at Longleat?