Just got back from Cornwall and my suggestions to add are Carne Beach nr Veryan(national trust but free and plenty of parking), Healeys Cyder Farm nr Perranporth (worth a visit just to see how Cider is made - though the Cornish Rattler is superb), Goran Haven, super little place and £2.50 to park all day, I said to the Car Park attendant I was in the Bongo and the roof was raised for changing before and after the beach, he said no worries and stay overnight if you want...
Other than the very changeable and very wet weather we enjoyed ourselves and will be back......