If you can get to Godrevy beach -(North Coast, not far from Falmouth) it's worth it. No real TMA liks but a staggeringly beautiful beach witha picture-perfect lighthouse on an insland about half a mile offshore and regular seal sightings.
Gets a bit touristy, so get there early on and you'll get the whole place to yourself.
Failing that, a boat trip over to St Mawes is fun.