Route map: https://www.outdooractive.com/
The walk shown is an easy 1.3 mile walk one-way from Land’s End to Sennen Cove. Obviously you can walk back the same way. However it should be noted that there is a bus service that runs between Sennen Cove and Land’s End is offer you some options.
For bus services and timetable: (check out bus service 1/1A) https://www.transportforcornwall.co.uk/services/TFCN/1