We went for a family walk around Box Hill which was quite a long way from Cambridge (almost a 2 hour drive!), but was worth it for some steapish climbs and wonderful views! It takes it’s name form the ancient Box Woodland that can be found on the steepest West-facing chalk face slope. Local historians says that witches once used to congregate in their Covens on Box Hill, because they believed the Box Trees enabled them to better interact with the spirit world.
The land is owned by the National Trust - so free car parking if you are members, although the car parks were busy and there is a cafe, shop and toilet facilities. The walk was muddy in places with steep steps up and down.
There are a number of other routes you can walk and one has some natural
play equipment for the kids which I am sure P might have liked!