Hi Julian.
What about the Millenium Walk/Lune Valley Walk? Very accesable with wheelchair, (old railway and tarmacked) Follows the River Lune with some spectacular views and wildlife! You can drive up to the Crook o Lune for probably the best panorama in the area, the Lune Valley with views of 3 peaks. Have a peep HERE Also plenty of wildlife that are used to people, AND a place for coffee & snacks! What more could you want?