If you are as lucky as I am living close to the peak district national park in the UK. During the summer I love to visit Chatsworth House and gardens, anytime family and friends come to visit me I always suggest going there.
The duke and duchess of Devonshire live in part of the house and the remaining part is a museum which is well worth walking around. You can also walk around the gardens which are very pleasant as well.
Behind the main car park is a large children's playground which they will absolutely love.
So if you are living outside of the UK and looking to come for a holiday then would suggest visiting Chatsworth and will be an experience you will never forget...