One of our favourite websites for finding campsites is www.campsitechatter.com.  It lists campsites near to places, landscapes and activities that are interesting.  Some of which are listed on the links below:
Active Farm campsites Campsites near Birdwatching Cycle Camping Naturist Camping Beach holidays in Devon Campsites near Brewery Tours Dog Friendly Campsites Pampered Camping Best beaches in Cornwall Campsites near Canyoning Eco Camping Pubs with campsites Best beaches in Wales Campsites near Coasteering Garden Camping Quiet Campsites Camp near a Summer Festival Campsites near Dog Friendly Pubs Group Camping Scuba Diving Camping Camping at Christmas
Campsites near Fly Fishing Heritage Railways in Wales Small Campsites Camping in the Forest Campsites near Great British Gardens Holidays on Dorset Beaches Surfing Camping near Bluebell Woods Campsites near Rock Pooling Horse Riding The A-Z of city Camping Camping near Scottish Lochs Campsites near top UK attractions Camping under dark skies UK Campsites near Vineyards Lakeside Camping UK Campsites near Free Days out Campsites for Detectorists Campsites near White Water Rafting