Ruby has been down here a few times. Good tread here.
http://www.z4-forum.com/forum/viewtopic.php?f=5&t=66169&hilit=Cornwall
People do love St Ives. Bit too busy for me. But plenty to do what ever the weather. St Just is a charming place, as long as you get good weather again you'can get there from St Ives in 30mins. Be sure to seek out a few coastal tin mines.
Newquay is a tourist honey pot for youngsters, night life there is like any other town up and down the country. Day time it's a prety boring place unless your a surfer, in which case you have plenty to do. Bedruthan steps and Watergate bay are both worth a Google for better places to stay if your looking at the area North of there.
The South coast has many picturesque Fishing villages. Looe Polpero, Fowey, Mevagissy, Charlston, Mullion & Porthlevan all have the traditional mix of local pubs, guest houses, coastal walks, stunning views and friendly people. The Minack theata Porthcurno is a must see. I think you have to book these days
Best roads... well your a bit stuffed in June. As soon as you are West of Bodmin, they are all full of tourist traffic.

If you stick to the east of the County then there are some crackers, plenty wide enough for PVR and with very little traffic right through the year.
Where ever you choose, it's a great place and the pace of life is errr different to the rest of the country. Didn't get in from surfing untill 6pm tonight. :wink: