I ended up staying eleven days on Jersey, and it is only a small island, 9 miles by 5. Partly I stayed because the people were so friendly. But also because in the summertime there are extra buses to get to various bays. I ended up walking quite a bit of the coastline by catching a bus to one bay, walking, then catching a bus back again to St Helier. Here is a shot of some coastline north-west of Rozel, and also a sign in "miles" along the coastal footpath.