mrmike, Fowey is your best bet for a day out. Park at Caffa Mill. Nice concrete slip FOC. Parking isn't cheap but overflow car park 100 yards back up the road is £5 per day. Lots to see in Fowey harbour. Polruan, across the harbour has free pontoon. Drinks for your lunch from The Lugger. If sea is flattish you can explore coast outside harbour. Yesterday I went with my wife in our Avon 3.4m 4hp Mariner round Gribbin Head to Polkerris.
Depending on tide you can also explore upriver towards Lostwithiel. You can also tie up at the pontoon and explore Fowey itself. A lovely town. Church, castle, museum, restaurants, pubs, shops. Magic.
Further afield, Falmouth is a good day out, and, my local is Saltash - free parking and launching (concrete slip) access to Devonport Dockard, the river Lynher, Plymouth Sound, The Hoe. A lovely day out. Enjoy your holiday.
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