With 14 national parks in the UK, there is sure to be a wilderness a couple of hours drive from wherever you live. The Peak District, which covers 555 square miles from Ashbourne in Derbyshire to Marsden near Huddersfield, is among the most popular of the national parks, attracting an estimated 10 million visitors each year. Young people can take part in a range of activities there, from climbing and mountain biking to more leisurely activities such as nature walks and bird watching....