3.) DIY Snacks
Most parents take packed lunches to save money, but snacks really add up too. Keep a selection of snacks in a carry bag.
Take a picnic and perhaps if your little (and big) monsters deserve it, buy them an ice cream at the end as an extra treat.
4.) The more the merrier
Sometimes it pays to go in a larger group. Attractions such as Alton Towers you can save 30% on tickets if you book as a group. Also Whipsnade zoo offers a great discount if booking together with others.