Over the past two years I have been around several distilleries on their visitors tours. Anyone going to Scotland on holiday, I consider the following the best:
Ardbeg (Islay) - the best tour (and distillery cafe) by far - the one I was on - by the distillery managers wife - was 90 minutes long and ended in tastings of some of their rarer bottlings. £2.50 (redeemable against shop purchases).
Glenfiddich (Speyside) - good and free if you dont mind the crowds. Also free dram at the end (if you are driving they will give you a miniature)
Edradour (Highland) - might be Scotlands Smallest, but the tour is free (and much better than nearby Bells) and pretty.
Strathisla (Speyside) - Start with a free coffee end with a free dram - one of the prettiest distilleries.
Glen Grant (Speyside) - Interesting tour and dram at the end of their garden.
Isle of Jura - didnt do a tour but went in the shop and automatically given several complementary drams. Worth going for the scenery and the isolation.
Fettercairn (Highland) - not bad - given a dram during the introductory video.
Glenlivet (Speyside) - Modern distillery - average tour. Good shop.
Bowmore (Islay) - again didnt do the tour but complimentary drams if you look like you are buying.
Glenmorangie (Highland) - good tour but not as good as its Islay sister Ardbeg
And the worst tour ....
Isle of Arran - sorry guys - new distillery poor tour! The guide did not know the first thing about whisky distilling and it was also one of the dearest at £3.50 to get in. Cafe poor quality food and slow service. Also swamped by midges on the car park.