In reply to Lankyman:
> If you don't mind a short drive, Norber Erratics near Austwick are like a natural sculpture park that the kids could be let loose in.
There is a great children's play ground at Austwick, where you can park without blocking up local's lanes. As well as the Erratics, there is a nice flat circular walk from there including clapper bridges which seem exciting to youngsters and allow for "fishing" opportunities or a little paddle in relative safety for that age.
The old lime kiln at Langcliffe is exciting for that age as it is like a big circular tunnel with loads of exits all the way around to let in light or to let out those who have had enough. Next to the Settle Carlisle railway line, so there is potential of seeing a passing train from very close quarters.
Grass Wood near (walking distance) to Grassington is good for just charging around or den building and should be in bluebell bloom at the moment. Bottom half goes down to the river. An adult could drive down to the woods, walk back and then you have an "emergency" vehicle if some legs are too tired to walk back again.
Post edited at 10:03