Pity it's not done anymore in the Uk, still have fond memories as a 12 year old of a BMI DC-9 trip back from Jersey to Glasgow, spent a good 45 minutes in the cockpit.
Yup... pity indeed.
I've got fond memories of being at the pointy end of a 747 and being allowed to twiddle the HDG knob to help the crew route around some evil looking clouds.