Geevor Tin Mine, 01736 788662. Every day except Sa, Easter-Oct 9AM-4PM, Oct-Easter tours start at 11AM, 1PM, 3PM. You can see an exhibition about mining and the go on a guided tour. The first part of the tour is through the processing facilities above ground. (How did they get the tin out of the stones?) The second tour is through one of the early mining tunnels. 6.50£
St Ives to the North along the North Coast Road (B3306) - essentially a 15 mile rally course, recommended to drive it at night as fast as you can. Wear seatbelts and keep an eye for oncoming traffic doing the same.