I've written up quite a few of my trips there for the Heritage Journal - take your pick from any of the posts from these searches:

My latest posts: https://heritageaction.wordpress.com/?s=cornwall+diary
A series of walks: https://heritageaction.wordpress.com/?s=penwith+wanderings
The Stone Circles: https://heritageaction.wordpress.com/?s=cornish+stone+circles

I'm off down there again next week, so will no doubt add some further notes.