We are planning six nights in Cornwall next July and here is what was provided to my on this blog:
Dartmoor - Roam this distinctive craggy landscape and take a glimpse at the Dartmoor ponies grazing in the shadow of the granite outcrops.
Exeter - Stroll through this ancient Roman city, from the magnificence of its gothic cathedral to the city’s medieval underground passages.
Boscastle - One of the last remaining unspoilt harbour villages in the British Isles, the medieval harbour and its charming fishing boats are a joy to see.
Tintagel Castle - This ruined castle full of Arthurian legend is perched on cliffs above an immense cave full of magic.
Land's End - This iconic location is lined with coastal paths and cliff trails.
St. Ives - An artists’ haven for over 100 years, with galleries on narrow streets and a beach that’s a surfers’ paradise.
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Look at the following map - the areas coloured green are the most scenic - but you would need to drive yourself to see most of them.https://www.google.co.uk/maps/@50.6914159,-3.9433723,9.21z/data=!5m1!1e1
These places are very attractive - find them on the map and then Google them. DARTMOUTH, SALCOMBE, POLPERRO, FOWEY, EDEN PROJECT, LOST GARDENS OF HELIGAN, TREBAH & GLENDURGAN GARDENS (near Falmouth), ST. MICHAELS MOUNT, MOUSEHOLE, PORTHCURNO (Minack Theatre - curtinto the cliffs), LAND’S END (although commercialised), ST.IVES, PADSTOW, TINTAGEL, CLOVELLY, LYNMOUTH, SELWORTHY, DUNSTER. Avoid Newquay! Truro is fairy attractive and being central, makes a good base for touring Cornwall.
Roads across Dartmoor can be ‘challenging' for foreigners. Exeter is worth a look but can be difficult to drive in and out of due to congestion. Plymouth has the quay from which The Pilgrim Fathers set sail for America but the city is not that interesting/attractive.
Regarding driving or not - zoom down on the map and then select street view for some of the places mentioned. Most have tiny narrow streets and as a result, car parks are found on the edge of towns.
Cornwall with a car is a necessity for me . I like the idea of taking the train as far as Exeter and then hiring the car , On the trips that I have made to Cornwall , I picked up the car at Heathrow and drove , but I made a number of stops along the way , thus breaking up the drive . There is a lot to see , you need to read up and make your choices accordingly . The Tin mining history and the impact on the Cornish economy was fascinating . As well , the small village of Coverack on The Lizard was a charming place . This book , by Mark Kurlansky has a fair amount of information about the fishing industry in Cornwall ., and its parallel to that in Gloucester , Massachusetts - https://www.amazon.com/Last-Fish-Tale-Atlantic-Gloucester-ebook/dp/B0017T0A30/ref=sr_1_1?crid=2041EN8VJ7NPE&keywords=the+last+fish+tale&qid=1562446637&s=gateway&sprefix=the+last+fish%2Caps%2C142&sr=8-1
I really enjoyed Tintagel, Minack Theatre, Mousehole, and St Michaels mount. St Ives is a popular destination, however I preferred the smaller, less touristy areas.
I liked both the Eden Project and the Lost Gardens of Heligan. They're close to each other, but both are quite large. I think trying to do both on the same day would just result in paying two (rather expensive) entry fees and rushing. But I when I pay to go inside a tourist attraction, I do tend to want to walk on every path, etc.
My general tip for the entire area: If you want to eat your dinner sitting down in a food establishment (as opposed to consuming fish and chips on the jetty), you had better make a reservation somewhere. I'm not sure about lunch, because for me that was just something I grabbed.
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As far as things I enjoyed, I, too, loved Lost Gardens of Heligan. Didn't do the Eden Project but we did a china clay mine tour at Wheal Martyn just outside St Austell. I'm not big on mine tours but it was more interesting than the Levant or Geevor Tin Mine we also did.