We walked down to the harbour and although beautiful didn't think there was much for the kids to do, until we heard laughter coming from inside the rocks! There turned out to be a secret passage through the rocks (which was quite dark and had water in it) that led through to a lovely beach at the other side. Our 3 year was ok walking through with an I Phone torch but might have struggled in the dark. Great climbing rocks. But be aware of the tide and make sure you don't get stuck at the far side of the beach - it comes in fast and we saw someone struggle to get back across the rocks.
Gorgeous little beach and harbour. Views are spectacular. I'm a total fidget and I sat on one of the "piers" for ages. Note at high tide most of the beach is covered but there are plenty of other places to sit, although I would advise wearing decent footwear as the best views involve going up some stone steps and clambering across a few rocks!
If you ignore the first larger car park there is a second smaller one with an honesty box closer to the beach.
Note at time of writing (July 2011), there is conservation work being done on a couple of cottages close to the harbour & beach so on arrival it looks a bit like a building site, but don't let this put you off - once you get closer to the sea, (especially at high tide), you can't hear anything but waves crashing on rocks!