A quick search on google will find a whole host of ideas for days out during your stay. I have endeavoured to find a few things that are a bit more unusual. Enjoy!
www.devonwildlifetrust.org Devon Wildlife Trust have lots of ideas for days out. They are looking for volunteers to record their sightings http://www.dbrc.org.uk/tell-us-about-your-sighting/
www.visitdartmoor.co.uk A broad range of activities can be found on mystical Dartmoor including Dartmoor Prison, Castle Drogo, learn how to rock climb and traffic free cycle trails to name a few.
www.english-heritage.org.uk/visit/places/berry-pomeroy-castle/ Take a walk to Berry Pomeroy Castle for spine tingling ghost stories; this was the would-be mansion of the notorious Seymour family. Enjoy a cream tea afterwards but remember this is Devon; cream first, then jam!
www.teignbridge.gov.uk/sports-and-leisure/parks-and-open-areas/parks/decoy-country-park-newton-abbot/ Take a picnic and drive to Decoy Country Park; hours of fun for the kids, with climbing area, zorbing, splash pad and more.
http://www.bodminjail.org/events-venue/upcoming-events-at-the-jail/ Drive out to Bodmin Jail if you dare! About 1.5 hours’ drive
http://www.exmoor-nationalpark.gov.uk/enjoying/ranger-experience Join a ranger on Exmoor for the day and experience a wild and hidden landscape. About 1.5 hours’ drive.
http://www.model-village.co.uk Babbacombe model village is a great day out with the kids ‘a miniature world that captures the imagination’
www.countryfile.com/go-outdoors/beach-cleaning-events-to-join-in-the-uk/ https://www.sas.org.uk/region/south-west/ Take part in with a beach clean