(S/E) From the car park at the end of Lower Pennington Lane, take the wide gravelled path leading straight ahead, beyond a gate (not the path off towards the shore on the left, which is our return route).
(1) Pass to the left of a large pond and follow the combined cycle and footway for almost a mile, ignoring turnings to left and right. Shortly after a path joins obliquely from the right, you meet a metalled lane beyond a gate.
Follow the lane, keeping straight on at a junction with a private road, until you reach the harbour at Keyhaven.
(2) At the near end of the car park, turn left onto a path running along the sea wall with the harbour on your right. Follow the path along the shoreline as it curves left, with views to Hurst Castle and the Needles beyond.
(3) After half a mile you reach a lagoon on your left, where you can either continue past a gate and along the embankment or follow a lower path to the left. The embankment swings left then right and, after another lagoon, crosses a drain (where a path leading off to the left provides a shortcut back to the start).
(4) Swing right, then sharp left past two more lagoons to reach a concrete jetty.
(5) Turn left here to leave the seawall and follow a straight path (which divides into two parallel strands partway along) for 750 yards back to the car park. (S/E)