Lovely walks along the coast and inland (many books/maps available to borrow)
Golf, swimming, gym, sauna, steam room at Dartmouth Golf and Country Club
Try canoeing on the Kingsbridge estuary with Singing Paddles( as featured on BBC Countryfile) -all abilities and great fun! http://www.singingpaddles.co.uk
Enjoy a beauty treatment or massage at the Garden Rooms in Strete