Some of these links are a bit intermittent.
My favourites at the moment are the Minack Theatre cams and the Cliff Hotel Penzance Cam.
Porthtowan has the amazing blue - bar / beach brasserie. The food is gorgeous and the lager is so good. What makes this cam for me is the memory of sitting in one of the bay windows in late autumn with the same view.
Was it too cold to surf?
...and of course the blue cam -
Overlooking Falmouth is a great Cam (and cam) with the perfect view of the harbour area and passenger ferries ply to and St.Mawes and Flushing. In the summer one ferry runs up to Truro.