Beamish Museum is a great day out for our family! It gives the little one plenty of fresh air which makes for a better night sleep (usually). It is around £20 for an adult ticket but there are family tickets available if your child(ren) no longer qualifies for free entry. Once you have bought a ticket you can visit for a year on that ticket. After your initial visit it can be a free family day out if you take a packed lunch and have the willpower (which I usually don't) not to buy anything in the tearooms, sweetshop, bakery or fish and chip shop.