The Sea Wall
This is the rockiest beach you'll find anywhere. It is located on the southwestern tip of the island. There is the Sea Wall  Campground located in the forest on the other side of the road from the Sea Wall. We toured the campground on our bikes. It is has very nice woodsy sites. Since it was June and school was still in session there were a lots of sites available.
You can spend a lot of time looking for shells, but because of the rocks it's rare to find an unbroken one.
However, it's fun to observe  the many cormorants and gulls.