There is a good car park on the right as you approach the village.
(S) From the car park take the path through the gate past a building below and left of the path. It soon curves right with a nice garden on the left until it joins a road. Take the road to the first junction (1) and turn left.
Follow the road to another junction with the Jolly Fisherman in front of you, turn left again and walk towards the harbour (2).
At the harbour take the path along the harbour edge and at the end turn left and take the road up and then right past some cottages to the road end (3). There is a gate, please take notice of the signs as livestock (cattle and sheep) are often found in the field beyond; please keep all dogs on a lead.
Take the obvious path across the shoreline fields, drop onto the shore itself if you wish to. You will pass through another two gates; at the second one follow the more obvious lower path straight ahead before turning left and heading up towards the castle itself (4)
The castle is owned by English Heritage, members will get in for free otherwise you will need to pay for entrance. There are chemical toilets and tea/coffee in the entrance shop.
Return via the same route.