In reply to Bobling:
Not helpful in terms of climbing, but in terms of nice days out for the scooter pilot, maybe try looking at some of the disused bits of railway/tramway? The granite way (sort of Sourton-ish), might be a goer (disused railway that's now a cycle trail), likewise heading out towards Kings Tor etc from either Princetown (which also has cafes and public bogs) or Yellowmeade.
It's also quite nice to head out to the Row Tor parking on a wild, bleak day. How far you could take a scooter round the ring road depends on how robust the scooter is and how bold the pilot is (not all scooters are driven by old grannies, after all), and how many friends are available to help, but it could be either type 1 fun, type 2 fun, or just a good place for coffee and a natter while you sit and admire somewhere impressively bleak...