In that area there's the small stone at Mabe Churchyard and the Eathorne Menhir (recently re-erected) and more (DA/medieval) stone crosses than you could shake a stick at if you know where to look.

There's also Piskie Hall and all the various sites on the Lizard within just a short drive. I did a write-up on a lot of the Lizard stuff (south of the Helford River) on the Heritage Journal a while ago. See http://goo.gl/m2b79 for details which might help.

Spoilt for choice! Though admitted there's not much on the east side of the Fal other than a couple of barrows down Veryan way... :-)