A few miles south of Truro, hidden in trees above the creeks, is Trelissick. It has beautiful gardens with a nice tea shop and is an escape from the crowds on a week day.
Afterwards, if you leave the car parked and walk down towards the ferry via the road, you can take the footpath north or south along the wooded edge of the river to find many tranquil deserted creeks where you may spot a lone heron. This is a very different side of Cornwall that many people don't see.
4 miles south of truro on the B3289
Combe Martin is about six miles out of Ilfracombe on the A39.
It's excellent for rockpools. Head onto the beach and walk to the cliffs on the right. At low tide you will find a path that follows the base of the cliff and around the headland about 200m.
It has an abundance of big and small rockpools full of sealife.
Keeps the kids (and dads) happy for hours.
There is also a lovely stretch of sandy beach exposed beyond the water break at low tide.
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