Try your hand at mackerel fishing with the locals, visit the colony of grey Atlantic seals on Seal Island, or take a trip to Godrevy Lighthouse (made famous in Virginia Woolfe's 'To the Lighthouse') and the ominously named Hell's Mouth. There's a good selection of boat trips to choose from at St Ives harbour - Derek is the man to speak to, you'll find him at St Ives Boats, outside the Lifeboat station.