you should also visit the Men an tol - great if you want to get fertile - sennen cove is beutiful - St Just probably has the most Paganny stuff going on - they almost undoubtedly some sort of ceremony going on at the Merry Maidens -do check out the Minack theatre :http://www.minack.com/
and next to it is porthcurno beach which always has lovely blue turquoise water even on a stormy day. They say Cornwalls liek a Christmas stocking - all the nuts fall to the bottom - check the eden project out as well :http://www.edenproject.com/
always lots going on there. I have lived in Cornwall on and off for years theres some really special places and always some new secret to find - I hope you have a great trip.