Go for a walk along the water's edge and get some fresh air at Mullion Cove Harbour. It's always nice watching the boats coming and going.
You'll soon see why this Helston place for ships to anchor is a hit with travelers. If you're looking for other things to keep you busy, Lizard Point, The Loe, and Kynance Cove are in the area too. They won't take long to reach from Mullion Cove Harbour.