I live here…used to hate it, now I love it.
Don’t travel down on a Friday night or Saturday.
plenty of empty coastal spaces. Just do research and try to stay away from the touristy ones.
beware google maps and be prepared start early or to walk. The car park at pixies for example is at the end of a long narrow lane, on a Saturday mid season its toppers with cars with roofboxes attempt to reverse.
If you want seclusion go to Scotland and enjoy mull/islay/jura. If you want the beach life come to Cornwall